If circumstances inside pyghmi cause it to be looping in
an event loop, confluent was getting work done, but
the code to wake up the eventlet greenthreads wouldn't get tickled.
Address this by also waking up waiters in the function that is
invited to the pyghmi event loop party.
Previously, one ipmi failure would tank all consoles and commands.
Now, at least console failures are isolated.
Next stop is to isolate command failures, then fix up session recovery.
