Reset reconnect delay on manual reconnect, add delay event

This is just a hotfix workaround for an underlying problem. The
`_connect_routine` code is "blocking" (in an async way) for
`connect_loop_wait` seconds, so that a fresh-started manual reconnect
will be silenty delayed. This code does the following changes:

1. It moves the delay to before the DNS resolution (with the exponential
   back-off it might well be that the DNS records are changed while
   slixmpp is waiting).

2. It adds a new event `reconnect_delay` that gets passed the number of
   seconds it will delay before actually reconnecting

3. It resets the `connect_loop_wait` timer on a manual connect/reconnect
   call to fix the interactive experience.

A *proper fix* would replace the sleep in `_connect_routine` with a
properly timered re-invocation of it, but I don't understand enough of
asyncio for pulling off that magic, and this is actually a proper
improvement. Also I tested this and it works!

0 files changed, 0 insertions, 0 deletions