regression-unit-test.cc requires CouchbaseMock.jar

Change-Id: I63e4d4e116679f61ea0ae50fdde2f8bde0dbc244
Reviewed-on: http://review.couchbase.org/23666
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>