Description of problem:
Upgrade failed at task [Restart master API]

Version-Release number of the following components:
openshift-ansible-3.9.0-0.34.0.git.0.c7d9585.el7.noarch

ansible-2.4.2.0-2.el7.noarch

# ansible --version
ansible 2.4.2.0
  config file = /etc/ansible/ansible.cfg
  configured module search path = [u'/root/.ansible/plugins/modules', u'/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python2.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 2.7.5 (default, May  3 2017, 07:55:04) [GCC 4.8.5 20150623 (Red Hat 4.8.5-14)]

How reproducible:
Always

Steps to Reproduce:
1. setup OCP 3.7 HA containerised RHEL cluster on EC2 with LB
2. upgrade containerized OCP on RHEL from v3.7.27 to v3.9.0-0.34.0
# ansible-playbook /usr/share/ansible/openshift-ansible/playbooks/byo/openshift-cluster/upgrades/v3_9/upgrade_control_plane.yml

Actual results:
Failure summary:

  2. Hosts:    ec2-54-82-218-154.compute-1.amazonaws.com
     Play:     Upgrade master
     Task:     Restart master API
     Message:  Unable to restart service atomic-openshift-master-api: Job for atomic-openshift-master-api.service failed because the control process exited with error code. See "systemctl status atomic-openshift-master-api.service" and "journalctl -xe" for details.


Expected results:
Upgrade succeeds