Added test for CBSE-1036.

Ensure that clients created with configuration
cache, both with an existing config and without
do not interupt the clients ability to perform
durability requests.

Change-Id: Ic0424425e20fee69e6d8a5f26543829a4ad59617
Reviewed-on: http://review.couchbase.org/36205
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>
Tested-by: Brett Lawson <brett19@gmail.com>