Report irc.client.ServerConnectionError messages on connection errors

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Handle nick-already-in-use error and stop daemon

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Enable running tests in Python 3 without 2to3

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Make kaoz codebase python3-compatible

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>
Remove 2to3 option in setup.py

Signed-off-by: Nicolas Iooss <nicolas.iooss_git@polytechnique.org>