updating enable_ceph conditions for controller

updating enable_ceph conditions for controller

- keeping enabled based on ceph node count being greater than 0
- adding enabled if ControllerEnableCephStorage is true

Intention here is to be able to run ceph without having dedicated
nodes for. Enabling Ceph alternativly from the ControllerEnableCeph
parameter allows ceph to be colocated on the controllers without
having to run any dedicated ceph nodes.

Change-Id: I71062d37226c679156380c0f4e194b51cb586bcf
Signed-off-by: Dan Radez <dradez@redhat.com>