Update cinder install for RHEL, Fedora and CentOS to use targetcli.

RHEL 7, Fedora 21 and CentOS 7 now use targetcli (LIO) in place of tgtd.

Change-Id: I864c4c7bfd368f68d434e204df640c7b69e6bcad
closes-Bug: #1342812
Merge "Update cinder install for RHEL, Fedora and CentOS to use targetcli."