Enable in-cluster loadbalancing of kubernetes API

I originally disabled this because i couldn't successfully deploy the
API this way, but it was probably caused by garbled up node hostnames,
which was fixed in I1c0251be58535d59fe0ec157cb9acaba209e8732.

Change-Id: I0f51e971fad11568c2f9db13c0d1c54122c51f5d

extraconfig/services/kubernetes-master.yaml

@@ -118,7 +118,6 @@ outputs:
                   kubeconfig_localhost: true
                   kubectl_localhost: true
                   artifacts_dir: '{{playbook_dir}}/kubespray/artifacts'
-                  loadbalancer_apiserver_localhost: false
             - name: generate kubespray playbook
               copy:
                 dest: "{{playbook_dir}}/kubespray/playbook.yml"