freshmaker: remove testmodule from whitelist

Token for talking with MBS has not been ready yet, remove this to
prevent error messages on stage.

inventory/group_vars/freshmaker-stg

@@ -20,9 +20,9 @@ freshmaker_admins:
 
 freshmaker_dry_run: True
 freshmaker_log_level: debug
-
+#
-freshmaker_handler_build_whitelist:
+#freshmaker_handler_build_whitelist:
-  global:
+#  global:
-    module:
+#    module:
-    - name:
+#    - name:
-      - testmodule
+#      - testmodule