chore: rev Linux VHDs to 2020.04.21

[jackfrancis]

Reason for Change:

This PR revs Linux Ubuntu 18.04-LTS and 16.04-LTS VHDs to 2020.04.21.

Includes the following additive pre-downloaded artifacts:

• Azure CNI version 1.1.0

No longer includes the following:

• Azure CNI version 1.0.29

Includes the following additive pre-installed apt packages:

• linux-headers-5.0.0-1036-azure

No longer includes the following:

• linux-headers-5.0.0-1035-azure

Includes the following additive pre-downloaded images:

• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.18.2
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.18.2
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.18.2
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.18.2
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.17.5
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.17.5
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.17.5
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.17.5
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.16.9
• mcr.microsoft.com/oss/kubernetes/azure-cloud-controller-manager:v0.5.0
• mcr.microsoft.com/oss/kubernetes/azure-cloud-node-manager:v0.5.0
• mcr.microsoft.com/k8s/csi/azuredisk-csi:v0.7.0
• mcr.microsoft.com/k8s/csi/azurefile-csi:v0.6.0
• mcr.microsoft.com/oss/kubernetes-csi/csi-node-driver-registrar:v1.2.0
• mcr.microsoft.com/oss/kubernetes-csi/csi-provisioner:v1.5.0
• mcr.microsoft.com/oss/kubernetes-csi/csi-snapshotter:v2.0.0
• mcr.microsoft.com/oss/kubernetes-csi/snapshot-controller:v2.0.0
• mcr.microsoft.com/k8s/csi/secrets-store/provider-azure:0.0.4
• mcr.microsoft.com/oss/kubernetes/autoscaler/cluster-proportional-autoscaler:1.7.1
• mcr.microsoft.com/oss/kubernetes/autoscaler/cluster-proportional-autoscaler:1.1.2-r2

No longer includes the following:

• k8s.gcr.io/kube-addon-manager-amd64:v8.9.1
• mcr.microsoft.com/oss/kubernetes/kube-addon-manager:v8.9.1
• mcr.microsoft.com/oss/kubernetes/autoscaler/cluster-autoscaler:v1.13.9
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.18.0
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.18.0
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.18.0
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.18.0
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.17.3
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.17.3
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.17.3
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.17.3
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.16.7
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.16.7-azs
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.13.12
• mcr.microsoft.com/oss/kubernetes/cloud-controller-manager:v1.13.12
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.13.11
• mcr.microsoft.com/oss/kubernetes/cloud-controller-manager:v1.13.11
• mcr.microsoft.com/oss/kubernetes/azure-cloud-controller-manager:v0.4.1
• mcr.microsoft.com/oss/kubernetes/azure-cloud-node-manager:v0.4.1
• mcr.microsoft.com/k8s/csi/azuredisk-csi:v0.5.0
• mcr.microsoft.com/k8s/csi/azurefile-csi:v0.3.0
• mcr.microsoft.com/oss/kubernetes-csi/csi-cluster-driver-registrar:v1.0.1
• mcr.microsoft.com/oss/kubernetes-csi/csi-node-driver-registrar:v1.1.0
• mcr.microsoft.com/k8s/csi/secrets-store/provider-azure:0.0.3

Includes a new 18.04-LTS Linux kernel:

• Linux version 5.0.0-1036-azure (buildd@lgw01-amd64-038) (gcc version 7.5.0 (Ubuntu 7.5.0-3ubuntu1~18.04)) Update go-dev tools image for go 1.11.2 #38-Ubuntu SMP Sun Mar 22 21:27:21 UTC 2020

Includes a new 16.04-LTS Linux kernel:

• Linux version 4.15.0-1077-azure (buildd@lcy01-amd64-022) (gcc version 5.4.0 20160609 (Ubuntu 5.4.0-6ubuntu1~16.04.12)) Add support for Kubernetes 1.12.4 #82-Ubuntu SMP Thu Mar 26 03:25:09 UTC 2020

Issue Fixed:

Requirements:

• uses conventional commit messages
• includes documentation
• adds unit tests
• tested upgrade from previous version

Notes:

[codecov]

Codecov Report

Merging #3123 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3123   +/-   ##
=======================================
  Coverage   71.05%   71.05%           
=======================================
  Files         147      147           
  Lines       25671    25671           
=======================================
  Hits        18241    18241           
  Misses       6294     6294           
  Partials     1136     1136           

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[mboersma]

/lgtm