minor variable fix and reuse + handle auditlog redirected to stdout

roles/kubernetes/master/defaults/main.yml

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

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

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

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