core: Include VdsSpmIdMapDAODbFacadeImpl.get(vdsId) in VdsSpmIdMapDAO

Adds method VdsSpmIdMapDAODbFacadeImpl.get(vdsId) in VdsSpmIdMapDAO so
it can be used in engine.

Change-Id: Ic590281545123788ce62c740901c69de0ed00c33
Bug-Url: https://bugzilla.redhat.com/1090799
Signed-off-by: Martin Perina <mperina@redhat.com>