lp1086458 staff client memory leaks

lp1086458 staff client memory leaks

This was a shotgun attempt using the removeEventListener idea from Galen's
collab/gmcharlt/lp1086458_clean_up_after_some_event_listeners, except, it
doesn't work.  Just sharing it for reference.  The cycle collector log
described in the ticket still shows the leaked elements and event listeners
after the test scenario, and after many interations, the leak rate is
higher than Galen's patch, and I really don't see any change compared to
stock Evergreen either.

Signed-off-by: Jason Etheridge <jason@esilibrary.com>