NCBC-174:Fix invalid tests in Nunit project: Change the expected message and set default Http timeout to 1 minute

Change-Id: I852e77ee508cd75e81704150596e94d345fa6587
Reviewed-on: http://review.couchbase.org/24394
Reviewed-by: John C. Zablocki <john@couchbase.com>
Tested-by: John C. Zablocki <john@couchbase.com>