BUG-1332 added cbench distribution

- derived from base distribution
- zipped image is produced by default
- included into modules in order to make cbench distribution available
  as result of each automated build

Change-Id: I695c0189a8a6448aa9fa5ee3414fb100fb0fa7a4
Signed-off-by: Michal Rehak <mirehak@cisco.com>