CBLT-42:  actually insert build metadata instead of test strings

Change-Id: I61d85f5f2e33ef2dec90a2ecb1ad0536a5bd77aa
Reviewed-on: http://review.couchbase.org/37407
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>