Pacemaker / Red Hat: fix settle exec with lower timeout

Decrease the exec timeout for settle our Pacemaker cluster and avoid
waiting 1 hour...
Also work on a dev-branch while the pull-request has been merged.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>
Merge pull request #529 from enovance/fix-pacemaker

Pacemaker / Red Hat: fix settle exec with lower timeout