Dump current worker state

[yashh]

Can we send the SIGUSR1 signal to the pyres_manager and have it dump the current log traceback of workers?

kill -USR1 <pid of pyres_manager>

dump the current traceback to -f pyres.log

This feature is really useful because often there are workers that might get stuck on a memcache connection or some sort of service that is hung due to high CPU usage etc. Celery supports this feature and it would be good to have this in pyres as well.

[binarymatt]

i like the idea, i'd have to look into how this would be best accomplished