message: add extra dependancy to maxscale.
diff: @@ -143,7 +143,7 @@ $(build-images):
  build/centos7: images/centos7/Dockerfile
  build/mariadb: build/commons images/mariadb/Dockerfile
  build/mariadb-drupal: build/mariadb images/mariadb-drupal/Dockerfile
  -build/maxscale: images/maxscale/Dockerfile
  +build/maxscale: build/commons images/maxscale/Dockerfile
  build/postgres: build/commons images/postgres/Dockerfile
  build/postgres-drupal: build/postgres images/postgres-drupal/Dockerfile
  build/commons: images/commons/Dockerfile
  