Update FAQ with `What will happen to my clients` section

[sthirugn]

I tested today: I cloned from RHEL6 to RHEL7 box. after cloning, I turned katello-service off in RHEL6 box. updated /etc/hosts in my clients to point to the new satellite box and consumed packages from it

Summary: In the above setup, clients will work out of the box using the new cloned satellite.