Added "az acr" commands for Azure container registries

1. Added commands to manage Azure container registries
(create/delete/show/list/update).
2. Integrated repository list and show-tags commands to manage
repositories.
3. Added storage command group to manage storage account for container
registries.
4. Added credential command group to manage admin user credentials.
5. Added mgmt_acr SDK for Python.

src/command_modules/azure-cli-acr/README.rst

@@ -0,0 +1,182 @@
+Microsoft Azure CLI 'acr' Command Module
+==================================
+
+Commands to manage Azure container registries
+-------------
+::
+
+    Group
+        az acr: Commands to manage Azure container registries.
+
+    Subgroups:
+        credential: Manage admin user credential for Azure container registries.
+        repository: Manage repositories for Azure container registries.
+        storage   : Manage storage accounts for Azure container registries.
+
+    Commands:
+        create    : Create a container registry.
+        delete    : Delete a container registry.
+        list      : List container registries.
+        show      : Get a container registry.
+        update    : Update a container registry.
+
+Create a container registry
+-------------
+::
+
+    Command
+        az acr create: Create a container registry.
+
+    Arguments
+        --location -l       [Required]: Location.
+        --name -n           [Required]: Name of container registry.
+        --resource-group -g [Required]: Name of resource group.
+        --app-id                      : The app id of an existing service principal. If provided, no
+                                        --new-sp or -p should be specified.
+        --enable-admin                : Enable admin user.
+        --new-sp                      : Create a new service principal. If provided, no --app-id should
+                                        be specified. Optional: Use -p to specify a password.
+        --password -p                 : Password used to log into a container registry.
+        --role -r                     : Name of role. (Owner, Contributor, Reader).  Default: Reader.
+        --storage-account-name -s     : Name of new or existing storage account. If not provided, a
+                                        random storage account name will be generated.
+
+    Examples
+        Create a container registry with a new storage account
+            az acr create -n myRegistry -g myResourceGroup -l southus
+        Create a container registry with an existing storage account
+            az acr create -n myRegistry -g myResourceGroup -l southus -s myStorageAccount
+        Create a container registry with a new service principal
+            az acr create -n myRegistry -g myResourceGroup -l southus --new-sp -p myPassword -r Owner
+        Create a container registry with an existing service principal
+            az acr create -n myRegistry -g myResourceGroup -l southus --app-id myAppId -r Owner
+
+Delete a container registry
+-------------
+::
+
+    Command
+        az acr delete: Delete a container registry.
+
+    Arguments
+        --name -n [Required]: Name of container registry.
+        --resource-group -g : Name of resource group.
+
+List container registries
+-------------
+::
+
+    Command
+        az acr list: List container registries.
+
+    Arguments
+        --resource-group -g: Name of resource group.
+
+    Examples
+        List container registries and show result in a table
+            az acr list -o table
+        List container registries in a resource group and show result in a table
+            az acr list -g myResourceGroup -o table
+
+Get a container registry
+-------------
+::
+
+    Command
+        az acr show: Get a container registry.
+
+    Arguments
+        --name -n [Required]: Name of container registry.
+        --resource-group -g : Name of resource group.
+
+Update a container registry
+-------------
+::
+
+    Command
+        az acr update: Update a container registry.
+
+    Arguments
+        --name -n [Required]: Name of container registry.
+        --app-id            : The app id of an existing service principal. If provided, no --new-sp or
+                            -p should be specified.
+        --disable-admin     : Disable admin user.
+        --enable-admin      : Enable admin user.
+        --new-sp            : Create a new service principal. If provided, no --app-id should be
+                            specified. Optional: Use -p to specify a password.
+        --password -p       : Password used to log into a container registry.
+        --resource-group -g : Name of resource group.
+        --role -r           : Name of role. (Owner, Contributor, Reader).  Default: Reader.
+        --tags              : Space separated tags in 'key[=value]' format. Use "" to clear existing
+                            tags.
+        --tenant-id -t      : Tenant id for service principal login. Warning: Changing tenant id will
+                            invalidate assigned access of existing service principals.
+
+    Examples
+        Update tags of a container registry
+            az acr update -n myRegistry --tags key1=value1;key2=value2
+        Update a container registry with a new service principal
+            az acr update -n myRegistry --new-sp -p myPassword -r Owner
+        Update a container registry with an existing service principal
+            az acr update -n myRegistry --app-id myAppId -r Owner
+
+Update storage account for a container registry
+-------------
+::
+
+    Command
+        az acr storage update: Update storage account for a container registry.
+
+    Arguments
+        --name -n                 [Required]: Name of container registry.
+        --storage-account-name -s [Required]: Name of new or existing storage account.
+        --resource-group -g                 : Name of resource group.
+
+Get admin username and password for a container registry
+-------------
+::
+
+    Command
+        az acr credential show: Get admin username and password for a container registry.
+
+    Arguments
+        --name -n [Required]: Name of container registry.
+        --resource-group -g : Name of resource group.
+
+List repositories in a given container registry
+-------------
+::
+
+    Command
+        az acr repository list: List repositories in a given container registry.
+
+    Arguments
+        --name -n [Required]: Name of container registry.
+        --password -p       : Password used to log into a container registry.
+        --username -u       : Username used to log into a container registry.
+
+    Examples
+        List repositories in a given container registry if admin user is enabled
+            az acr repository list -n myRegistry
+        List repositories in a given container registry with credentials
+            az acr repository list -n myRegistry -u myUsername -p myPassword
+
+Show tags of a given repository in a given container registry
+-------------
+::
+
+    Command
+        az acr repository show-tags: Show tags of a given repository in a given container registry.
+
+    Arguments
+        --name -n    [Required]: Name of container registry.
+        --repository [Required]: The repository to obtain tags from.
+        --password -p          : Password used to log into a container registry.
+        --username -u          : Username used to log into a container registry.
+
+    Examples
+        Show tags of a given repository in a given container registry if admin user is enabled
+            az acr repository show-tags -n myRegistry --repository myRepository
+        Show tags of a given repository in a given container registry with credentials
+            az acr repository show-tags -n myRegistry --repository myRepository -u myUsername -p
+            myPassword

src/command_modules/azure-cli-acr/azure/__init__.py

@@ -0,0 +1,6 @@
+#---------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+#---------------------------------------------------------------------------------------------
+import pkg_resources
+pkg_resources.declare_namespace(__name__)

src/command_modules/azure-cli-acr/azure/cli/__init__.py

@@ -0,0 +1,6 @@
+#---------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+#---------------------------------------------------------------------------------------------
+import pkg_resources
+pkg_resources.declare_namespace(__name__)

src/command_modules/azure-cli-acr/azure/cli/command_modules/__init__.py

@@ -0,0 +1,6 @@
+#---------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+#---------------------------------------------------------------------------------------------
+import pkg_resources
+pkg_resources.declare_namespace(__name__)

src/command_modules/azure-cli-acr/azure/cli/command_modules/acr/__init__.py

@@ -0,0 +1,13 @@
+#---------------------------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See License.txt in the project root for license information.
+#---------------------------------------------------------------------------------------------
+
+#pylint: disable=unused-import
+
+import azure.cli.command_modules.acr._help
+import azure.cli.command_modules.acr._params
+import azure.cli.command_modules.acr.custom
+import azure.cli.command_modules.acr.storage
+import azure.cli.command_modules.acr.credential
+import azure.cli.command_modules.acr.repository