Reset 'MockEnvironment' for confmon tests (PORT)

Change-Id: I5638fb9e77a7828112c6d9717ee05cb3a37b7134
Reviewed-on: http://review.couchbase.org/34139
Tested-by: Mark Nunberg <mnunberg@haskalah.org>
Reviewed-by: Brett Lawson <brett19@gmail.com>
Reviewed-on: http://review.couchbase.org/34559