Disable exit on error for pacemaker commands for update flow
Disable exit on error for pacemaker commands for update flow

Package update fails on compute node, when yum_update checks for
pacemaker status via systemctl command. Because exit on error (-e)
option has been enabled recently, this issue is happening. Fixing
by, executing the command only on nodes where pacemaker is enabled.
Closes-Bug: #1668266

Change-Id: I2aae4e2fdfec526c835f8967b54e1db3757bca17

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates