Merge pull request #3113 from riverzhang/support-audit

inventory/sample/group_vars/k8s-cluster.yml

roles/kubernetes/master/defaults/main.yml

roles/kubernetes/master/tasks/kubeadm-setup.yml

roles/kubernetes/master/tasks/static-pod-setup.yml

...ubernetes/master/templates/apiserver-audit-policy.yaml.j2

...bernetes/master/templates/kubeadm-config.v1alpha2.yaml.j2

...tes/master/templates/manifests/kube-apiserver.manifest.j2

tests/files/gce_centos-weave-kubeadm.yml

tests/files/gce_centos7-flannel-addons.yml