Fix state event
This MR show that the state events are not propagated into the remote sessions.
As you can see, i have tested the position first, and it's fine. Only the state is not propagated.
pytest tests/motors/test_tango_axis.py::test_2_library_instances
assert ev_position.event_count > 0
assert ev_position.last_value == pytest.approx(2)
> assert ev_state.event_count > 0
E assert 0 > 0
E + where 0 = <bliss.testutils.eventutils.EventListener object at 0x7f80f409c450>.event_count
tests/motors/test_tango_axis.py:63: AssertionError
Would be useful to have backport to 1.9.