Fix malformed JUNIT XML with shellcheck failures

update k8s.gcr.io/k8s-dns-node-cache image version

Skip storage tests that depend on default SC - if no default SC is found

GCE/Windows: enable stackdriver logging agent

Fix shellcheck failures of hack/verify-openapi-spec.sh

Other tests that check for default storageclass also
check for cloudprovider such as gce, aws and openstack
and hence are already skipped in bare metal environments.

But this particular test keeps failing because no such check exists.

Fix scale and rollback subresources with admission webhooks, add integration tests

Fix bug and golint failures of hack/verify-api-groups.sh

Fix golint failures of pkg/kubectl/apps

Fix printing duplicated pod priorityClassName

Fix golint failures of pkg/apis/batch

Switch to instance-level update APIs for Azure VMSS loadbalancer operations

kubeadm: drop duplicate function NewCACertAndKey

Fix shellcheck failures of hack/cherry_pick_pull.sh

Fix shellcheck failures of hack/verify-readonly-packages.sh

Fix kubectl version --client=true

kubeadm: use 'errors.Errorf' instead of 'fmt.Errorf'

kubeadm: fix kubeadm alpha cert renew error in case of external CA

fix shellcheck in test-smoke.sh and test-network.sh

Update to go 1.12.4

kubeadm: cleanup unused func

add owners file to util/metrics and auto-labeling