chore: rev Linux VHDs to 2020.05.29

[jackfrancis]

Reason for Change:

This PR revs Linux VHDs to the 2020.05.29 image.

Includes the following pre-downloaded components:

• etcd v3.2.2
• Azure CNI v1.1.3

Includes the following pre-downloaded container images:

• mcr.microsoft.com/oss/kubernetes/dashboard:v2.0.1
• mcr.microsoft.com/oss/kubernetes/pause:1.3.1
• mcr.microsoft.com/oss/kubernetes/coredns:1.6.9
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.19.0-beta.0
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.19.0-beta.0
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.19.0-beta.0
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.19.0-beta.0
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.18.3
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.18.3
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.18.3
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.18.3
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.17.6
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.17.6
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.17.6
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.17.6

No longer pre-downloading the following container images:

• mcr.microsoft.com/k8s/core/pause:1.2.0
• mcr.microsoft.com/oss/kubernetes/autoscaler/cluster-autoscaler:v1.14.8
• k8s.gcr.io/coredns:1.6.7
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.19.0-alpha.3
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.19.0-alpha.3
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.19.0-alpha.3
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.19.0-alpha.3
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.18.1
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.18.1
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.18.1
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.18.1
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.17.4
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.17.4
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.17.4
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.17.4
• mcr.microsoft.com/oss/kubernetes/kube-apiserver:v1.17.4-azs
• mcr.microsoft.com/oss/kubernetes/kube-controller-manager:v1.17.4-azs
• mcr.microsoft.com/oss/kubernetes/kube-proxy:v1.17.4-azs
• mcr.microsoft.com/oss/kubernetes/kube-scheduler:v1.17.4-azs
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.16.8
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.16.8-azs
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.14.8
• mcr.microsoft.com/oss/kubernetes/cloud-controller-manager:v1.14.8
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.14.7
• mcr.microsoft.com/oss/kubernetes/cloud-controller-manager:v1.14.7
• mcr.microsoft.com/oss/kubernetes/hyperkube:v1.14.7-azs

Issue Fixed:

Requirements:

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

Notes:

[codecov]

Codecov Report

Merging #3378 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #3378   +/-   ##
=======================================
  Coverage   72.57%   72.57%           
=======================================
  Files         147      147           
  Lines       25215    25215           
=======================================
  Hits        18300    18300           
  Misses       5782     5782           
  Partials     1133     1133           

---

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[mboersma]

/lgtm

[acs-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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