vdsm: Removal of management_ip info in getCaps

'management_ip' property containing ip of vdsm
was removed from the result of getCapabilities because it
it was never used by the engine.


Change-Id: I5a5851a55995e7d1bb617cc958f8bfee7dfb994a
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/28993
Reviewed-by: Dan Kenigsberg <danken@redhat.com>