messaging3: Avoid self-send complexity

With the notify code I've hit another case where self-sends caused
a problem.  This time messages were lost because we tried to do
multiple dispatch_rec calls from within a single inotify callback.
Only the first one was being taken care of, the others did not find
receivers.

This patch makes self-sends go through the kernel as well, the
kernel queues everything nicely for us. With dgram messaging this
should be pretty fast. If it turns out to be a performance problem,
we can solve it later by doing proper queueing in user space. We
need to completely decouple any processing from callbacks.

Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>

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