BUG/MINOR: validation: ease regex validations

Ease regex validation on backend_switching_rule to allow using
variables for backend name. Also remove regex check for cookie in
backend and defaults to allow adding extra cookie parameters.

Author: mjuraga

build/haproxy_spec.yaml

@@ -271,7 +271,6 @@ definitions:
           type: string
           x-display-name: Continous Statistics
         cookie:
-          pattern: ^[^\s]+$
           type: string
         default_backend:
           pattern: ^[A-Za-z0-9-_.:]+$
@@ -537,7 +536,6 @@ definitions:
           type: integer
           x-nullable: true
         cookie:
-          pattern: ^[^\s]+$
           type: string
           x-dependency:
             mode:
@@ -1479,7 +1477,7 @@ definitions:
           type: integer
           x-nullable: true
         name:
-          pattern: ^[A-Za-z0-9-_.:]+$
+          pattern: ^[^\s]+$
           type: string
           x-display-name: Backend Name
           x-dynamic-enum:
@@ -2438,6 +2436,22 @@ definitions:
       $ref: "#/definitions/transaction"
   info:
       description: General API, OS and hardware information
+      example:
+        api:
+          build_date: "2019-08-21T17:31:56.000Z"
+          version: v1.2.1 45a3288.dev
+        system:
+          cpu_info:
+            model: Intel(R) Core(TM) i7-7500U CPU @ 2.70GHz
+            num_cpus: 4
+          hostname: test
+          mem_info:
+            dataplaneapi_memory: 44755536
+            free_memory: 5790642176
+            total_memory: 16681517056
+          os_string: 'Linux 4.15.0-58-generic #64-Ubuntu SMP Tue Aug 6 11:12:41 UTC 2019'
+          time: 1566401525
+          uptime: 87340
       properties:
         api:
           properties:

models/haproxy.yaml

@@ -151,7 +151,6 @@ defaults:
       x-display-name: Continous Statistics
     cookie:
       type: string
-      pattern: '^[^\s]+$'
     client_timeout:
       type: integer
       x-nullable: true
@@ -358,7 +357,6 @@ backend:
           value: http
     cookie:
       type: string
-      pattern: '^[^\s]+$'   
       x-dependency: 
         mode: 
           value: http 
@@ -1055,7 +1053,7 @@ backend_switching_rule:
       x-nullable: true
     name:
       type: string
-      pattern: '^[A-Za-z0-9-_.:]+$'
+      pattern: '^[^\s]+$'
       x-nullable: false
       x-dynamic-enum:
         operation: getBackends