Ensure keepalived is restarted when necessary.

Ensure keepalived is restarted when necessary.

If os-collect-config/config.json is updated before an upgrade/update,
then the os-net-config run will automatically erase the keepalived
managed ips.

This is a hackish way to ensure that keepalived is restarted during the
next phase in order to have the ip recreated.

It basically adds a comment line to the keepalived.conf file (making it
different than the puppet one) if it's there. This will force a puppet
restart of the keepalive service puting the ips back on the undercloud.

Change-Id: I56b706ff44ba31aa87a63f870940831ce02a6e77
Closes-Bug: #1640213
Related-Bug: #1638029