Handle the right exceptions for the notify socket

On Python 2.6 and 2.7, errors on socket operations raise socket.error
exceptions, not OSError.

See http://docs.python.org/2/library/socket.html
Log the path to the notify socket.

Needed for debugging.
Look for aq_notifyd in the global location, too
Package the aqd.py and aqd_notify.py scripts.