fix gometa service start up to accomodate multiple path in go path

Change-Id: I69a801825ec7985ac79d27f88f4151872966d54a
Reviewed-on: http://review.couchbase.org/43070
Reviewed-by: Xiaomei Zhang <xiaomeizhangatwork@gmail.com>
Tested-by: Xiaomei Zhang <xiaomeizhangatwork@gmail.com>