dsaversion: Adding raw_version_revision

Due commit 23a0c7199371a8f6b767b8f49c87da11b466d7da, currently
we cannot change the way we show version and release or it
will affect old oVirt Engine versions. To keep compatible,
this patch will add raw_version_revision which can be used
to show the version and revision during VDSM initialization.

Change-Id: I44b6a28e378c4090595e823588dbbe583a38a353
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=893193
Signed-off-by: Douglas Schilling Landgraf <dougsland@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/12952
Reviewed-by: Zhou Zheng Sheng <zhshzhou@linux.vnet.ibm.com>
Reviewed-by: Dan Kenigsberg <danken@redhat.com>