message: add python as dep of tests
diff: @@ -480,6 +480,7 @@ build/harbor-trivy build/local-minio: build/harbor-database services/harbor-redi
  build/harborregistry: services/harbor-jobservice/Dockerfile
  build/harborregistryctl: build/harborregistry
  build/harbor-nginx: build/harborregistryctl services/harbor-core/Dockerfile services/harbor-portal/Dockerfile
  +build/tests: build/python__2.7
  build/tests-kubernetes: build/tests
  build/tests-openshift: build/tests
  build/toolbox: build/mariadb
  