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!
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