Enable corosync log to pacemaker.log locally

In order to collect HA logs locally as well to syslog,
use either corosync logfile option or custom rsyslog
template, but not both.

This patch enables custom rsyslog template for
pacemaker.log to avoid messages duplicating in daemon.log.

Closes bug: #1275127

Change-Id: I237414f38c312243ad51e5d14f6c6141b684f956
Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>