Upgrade all testing linux CI machines to Ubuntu-20.04 (#3799)

.azure-pipelines-k8s-matrix.yml

@@ -15,7 +15,7 @@ trigger: none
 jobs:
   - job: Linux
     pool:
-      vmImage: ubuntu-16.04
+      vmImage: ubuntu-20.04
     strategy:
       matrix:
         kube_1.16:
@@ -46,7 +46,7 @@ jobs:
           curl -LO https://storage.googleapis.com/minikube/releases/latest/minikube-linux-amd64
           sudo install minikube-linux-amd64 /usr/local/bin/minikube
           sudo minikube start --driver=none --kubernetes-version $(kubernetes_version)
-          # Although the kube and minikube config files are in placed $HOME they are owned by root
+          sudo mv /root/.kube /root/.minikube $HOME
           sudo chown -R $USER $HOME/.kube $HOME/.minikube
         displayName: Install integration test dependencies
       - script: make node_modules