Fixes #19271 - reload docker instead of restart

[ahumbe]

Restarting docker service will stop all the running containers, so instead of restart we should reload the service which will not affect any running container.

[ahumbe]

As a part of installation of katello-ca-consumer package we do not make any changes to the existing docker configuration, can any one help me understand why need to restart/reload the docker service?

[ekohl]

Interesting. In #155 @stbenjam said there was no reload.

[ahumbe]

The reload option is there for the docker service, here is the output :

• service docker reload
  Redirecting to /bin/systemctl reload docker.service

• tail -f /var/log/messages
  May 2 10:39:53 rhel7u2-2 dockerd-current: time="2017-05-02T10:39:53.184676367-04:00" level=info msg="Got signal to reload configuration, reloading from: /etc/docker/daemon.json"
  May 2 10:39:53 rhel7u2-2 dockerd-current: time="2017-05-02T10:39:53.185286790-04:00" level=error msg="open /etc/docker/daemon.json: no such file or directory"
  May 2 10:39:53 rhel7u2-2 systemd: Reloaded Docker Application Container Engine.

[ekohl]

I assume @stbenjam is busy with Summit right now but I'd like his opinion on this.

[stbenjam]

I get an error on my box when I try reload but I guess it was added in 2015 and seems there on a fresh install on CentOS 7. So this should be OK

[ekohl]

After a trivial rebase Travis should be happy too.

[chris1984]

Looks good from me too