add go path to Makefile path
add go path to Makefile path

Change-Id: If73f7ff9cae3a30a32daa29cf891e1beb507b6ce
Reviewed-on: https://review.couchbase.org/c/perfrunner/+/176874
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Bo-Chun Wang <bb86fd206c9c35341feb9b50e74a74a83e254d63@couchbase.com>

couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner,couchbase/perfrunner