Feature: Add block storage (Cinder) support.
Reason: Previously we did not install Cinder with Foreman.
Result (if any):
* Cinder API has been added to the Controller hostgroups (both "Controller (Neutron)" and "Controller (Nova Network)".
* Cinder storage (where block storage data is stored) has a separate host group "LVM Block Storage", so that the storage capacity is scalable. This host group can be deployed only on hosts where "cinder-volumes" LVM volume group exists.