Don't invoke error callback from within lcb_connect

Change-Id: I8b9c4e0ace139d433811ad30ffa7028af4a2cb8a
Reviewed-on: http://review.couchbase.org/29772
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>