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: I6dac267ec8c89027f4e594f40506f595c582410b
Signed-off-by: pkliczewski <piotr.kliczewski@gmail.com>
Reviewed-on: http://gerrit.ovirt.org/29869
Reviewed-by: Dan Kenigsberg <danken@redhat.com>