Description of problem:

The current implementation of the Auto-fencing is not user friendly. The way in which it used now is by running twice the opnestack deployment command which takes a lot of time on medium and large environments.
current way:

1)  $DEPLOYCOMMAND
2)  openstack overcloud generate fencing -a reboot --ipmi-lanplus --ipmi-level 
    administrator --output fencing.yml instackenv.json
3)  $DEPLOYCOMMAND -e fencing.yml