BZ #1055179 - Trivial rename to Cinder Block storage

https://bugzilla.redhat.com/show_bug.cgi?id=1055179

Rename the "LVM Block Storage" host group to "Cinder Block Storage".
Also rename the underlying manifest to not include "lvm".
Merge pull request #242 from cwolferh/bz_1055179_rename_to_cinder_block_storage

BZ #1055179 - Trivial rename to Cinder Block Storage