[repo test] Avoid hangs in zmq repo unit test - interaction through the zmq event loop from a different thread is only allowed through add_callback - notify the background thread when the client dies with an exception so it doesn't spin forever

debian/tmp/usr/bin/cubicweb-ctl usr/bin/
debian/tmp/usr/lib/PY_VERSION/site-packages/cubicweb/cwctl.py usr/lib/PY_VERSION/site-packages/cubicweb
debian/cubicweb-ctl.bash_completion etc/bash_completion.d/cubicweb-ctl