Proposed Fix. Make sure we read all data from our SSL socket wrappers and don't just rely on gobject.io_add_watch, select or poll.

This isn't really a clean solution, but the less intrusives fix that I can think of. Fixes #2634.

 * Use namespace instead of attrs={} for addChild
 * Unplug SASL module on auth failure (we currently disconnect so don't really need it)

Coding standards and documentation improvements in dispatcher_nb.py. Many open questions remain at my side. Please check FIXMEs.

Fix a potential bug of missing an alarm_callback. Separate public from internal API.

revert [10848] That's not the way to solve the problem you're trying to fix: first keepalive packet is sent too early.