Add proper mock URL for tests.ini

Change-Id: I2c4adf30d8697723223058ec49cd1ee9c80c5a67
Reviewed-on: http://review.couchbase.org/29814
Reviewed-by: Volker Mische <volker.mische@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>