Get rid of legacy status 'Running'

The status 'Running' means 'Up' and Guest Agent is Responsive,
however this state is not used by the engine at all even before
version ovirt 3.0.
Now we are completely removing it as this is not helpful having
two states for Up.

Change-Id: Ie3c6e66365fe02158e5a7bb8db56c724b612b366
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>
Reviewed-on: http://gerrit.ovirt.org/21766
Reviewed-by: Dan Kenigsberg <danken@redhat.com>