Description of problem:
atomic-openshift-node service entered failed state after restarting `container-engine` in containerized environment.

Version-Release number of selected component (if applicable):
openshift-ansible-3.6.68-1.git.0.9cbe2b7.el7.noarch.rpm

How reproducible:
always

Steps to Reproduce:
1. Trigger containerized installation with docker system container
#cat inventory_hosts
<--snip-->
openshift_docker_use_system_container=true
openshift_docker_systemcontainer_image_registry_override=brew-xxx.redhat.com:8888/rhel7
containerized=true
<--snip-->

2. Restart `container-engine` after installation succeed.


Actual results:
`container-engine` restarted successfully, but the service atomic-openshift-node entered failed state.

#journalctl -u atomic-openshift-node
May 16 01:37:31 openshift-147.lab.sjc.redhat.com systemd[1]: Stopping atomic-openshift-node.service...
May 16 01:37:31 openshift-147.lab.sjc.redhat.com atomic-openshift-node[21144]: I0516 01:37:31.613392   21206 docker_server.go:87] Stop docker server
May 16 01:37:31 openshift-147.lab.sjc.redhat.com atomic-openshift-node[22447]: atomic-openshift-node
May 16 01:37:31 openshift-147.lab.sjc.redhat.com systemd[1]: atomic-openshift-node.service: main process exited, code=exited, status=1/FAILURE
May 16 01:37:31 openshift-147.lab.sjc.redhat.com systemd[1]: Unit atomic-openshift-node.service entered failed state.
May 16 01:37:31 openshift-147.lab.sjc.redhat.com systemd[1]: atomic-openshift-node.service failed.
May 16 01:37:37 openshift-147.lab.sjc.redhat.com systemd[1]: Dependency failed for atomic-openshift-node.service.
May 16 01:37:37 openshift-147.lab.sjc.redhat.com systemd[1]: Job atomic-openshift-node.service/start failed with result 'dependency'.


Expected results:


Additional info:
# cat /etc/systemd/system/atomic-openshift-node.service 
[Unit]
After=atomic-openshift-master.service
After=container-engine.service
After=openvswitch.service
PartOf=container-engine.service
Requires=container-engine.service
Requires=openvswitch.service
After=ovsdb-server.service
After=ovs-vswitchd.service
Wants=atomic-openshift-master.service
Requires=atomic-openshift-node-dep.service
After=atomic-openshift-node-dep.service

[Service]
EnvironmentFile=/etc/sysconfig/atomic-openshift-node
EnvironmentFile=/etc/sysconfig/atomic-openshift-node-dep
ExecStartPre=-/usr/bin/docker rm -f atomic-openshift-node
ExecStart=/usr/bin/docker run --name atomic-openshift-node --rm --privileged --net=host --pid=host --env-file=/etc/sysconfig/atomic-openshift-node -v /:/rootfs:ro,rslave -e CONFIG_FILE=${CONFIG_FILE} -e OPTIONS=${OPTIONS} -e HOST=/rootfs -e HOST_ETC=/host-etc -v /var/lib/origin:/var/lib/origin:rslave -v /etc/origin/node:/etc/origin/node -v /etc/localtime:/etc/localtime:ro -v /etc/machine-id:/etc/machine-id:ro -v /run:/run -v /sys:/sys:rw -v /sys/fs/cgroup:/sys/fs/cgroup:rw -v /usr/bin/docker:/usr/bin/docker:ro -v /var/lib/docker:/var/lib/docker -v /lib/modules:/lib/modules -v /etc/origin/openvswitch:/etc/openvswitch -v /etc/origin/sdn:/etc/openshift-sdn -v /var/lib/cni:/var/lib/cni -v /etc/systemd/system:/host-etc/systemd/system -v /var/log:/var/log -v /dev:/dev $DOCKER_ADDTL_BIND_MOUNTS openshift3/node:${IMAGE_VERSION}
ExecStartPost=/usr/bin/sleep 10
ExecStop=/usr/bin/docker stop atomic-openshift-node
SyslogIdentifier=atomic-openshift-node
Restart=always
RestartSec=5s

[Install]
WantedBy=container-engine.service