Investigation for "No processor" (See #8266)

These logging changes and fail-fast modifications were useful
in pinpointing the cause of the "No processor" error. Specifically,
they show that the usermode processor used by test_inputs.py was
being called and was communicating with the server *but* that when
the server tried to access the proxy an `ObjectNotFoundException`
was being thrown (caused by poor parsing).
Implement workaround clients.py (Fix #8266)

For each Glacier2.Router session whose category
ends in "\" (but not "\\") we immediately close
the session and create another one.

See:
http://www.zeroc.com/forums/bug-reports/6262-periodic-objectnotexistexception-glacier2-categories-post27018.html#post27018
Implement workaround for client.java (See #8266)
Implement workaround for client.cpp (See #8266)