Add contrib directory to the tarball

- Added contrib directory to the tarball
- Moved vdsm/ut/ivdsm.py to contrib
- Removed vdsm/ut/

Change-Id: I39fa49887de601bbb4ee605ef2da6a0a69809a66
Signed-off-by: Kiril Nesenko <knesenko@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/25861
Reviewed-by: Alon Bar-Lev <alonbl@redhat.com>
Reviewed-by: Federico Simoncelli <fsimonce@redhat.com>