Clear event watchers before invoking connection callback
Clear event watchers before invoking connection callback

This lets a socket remain "Idle" without receiving readability events.
Useful for an immediately-released connmgr socket

Change-Id: If57d6ac4adc3da48a0ac2b35f9cfe1c15eb07087
Reviewed-on: http://review.couchbase.org/33007
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Mark Nunberg <e7d42768707bf23038325b0b68d4b577e5f6064a@haskalah.org>

maxim-ky/libcouchbase,uvenum/libcouchbase,mnunberg/libcouchbase,maxim-ky/libcouchbase,maxim-ky/libcouchbase,kojiromike/libcouchbase,uvenum/libcouchbase,PureSwift/libcouchbase,PureSwift/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,mnunberg/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,uvenum/libcouchbase,mnunberg/libcouchbase,PureSwift/libcouchbase,mody/libcouchbase,kojiromike/libcouchbase,PureSwift/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,uvenum/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,mody/libcouchbase,avsej/libcouchbase,senthilkumaranb/libcouchbase,mnunberg/libcouchbase,signmotion/libcouchbase,senthilkumaranb/libcouchbase,mody/libcouchbase,avsej/libcouchbase,mody/libcouchbase,senthilkumaranb/libcouchbase,signmotion/libcouchbase,signmotion/libcouchbase,couchbase/libcouchbase,senthilkumaranb/libcouchbase,uvenum/libcouchbase,signmotion/libcouchbase,mnunberg/libcouchbase,maxim-ky/libcouchbase