jobs: vdsm_master_create-rpms_merged

yaml coding of the existing job vdsm_master_create-rpms_merged
moved to mock build.

Had to add some env variables, extra packages, and modify a bit the shell
scripts to be able to build vdsm without running the tests.


Change-Id: I0fe83d797188662d57a2a4b1f7bf7122f957ace1
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>