Update to recent CouchbaseMock.jar

Change-Id: Ie02798adc0ce129e1cd5eedb926681e78c1eb32e
Reviewed-on: http://review.couchbase.org/28771
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Mark Nunberg <mnunberg@haskalah.org>