incomplete patching of ophyd StatusBase
Fix for issue #53 (closed) introduced patching of ophyd.status.StatusBase until new version >1.9 is released.
However, the way the patching is done is too late and some classic StatusBase objects co-exist with
patched StatusBase, hence giving unpredictable results for isinstance() calls, and for the presence
of unwanted threads.
(observed thanks to BEC issue bec#366 (closed) )