Description of problem:
When openshift-ansible running step "Configure master for metrics", it only work on the first master.

Version-Release number of selected component (if applicable):
openshift-ansible-3.3.16-1.git.0.9ed3fd2.el7.noarch.rpm

How reproducible:
Always

Steps to Reproduce:
1.Install an HA master env with openshift_hosted_metrics_deploy=true enabled


Actual results:
Only the first master has metricsPublicURL configured. 
[root@gpei-test-33-ha-master-1 ~]# grep metricsPublicURL /etc/origin/master/master-config.yaml
  metricsPublicURL: https://hawkular-metrics.x.x.com/hawkular/metrics

[root@gpei-test-33-ha-master-2 ~]# grep metricsPublicURL /etc/origin/master/master-config.yaml
[root@gpei-test-33-ha-master-2 ~]#


Expected results:
All masters should have correct metricsPublicURL configuration

Additional info: