MB-9978 Wake up the connection notifier upon events.

The connection notifier is a daemon task that wakes up paused
connections. When an event arrives for a given paused connection,
we should wake up the connection notifier so that it can notify
the event to that paused connection.

Change-Id: I806c261992bf4da25b64b9fb49c6958c84f2270f
Reviewed-on: http://review.couchbase.org/32785
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Chiyoung Seo <chiyoung@couchbase.com>