add label for python_import_all_repositories

Author: mai93

python/private/common_labels.bzl

@@ -19,6 +19,7 @@ labels = struct(
     PRECOMPILE = str(Label("//python/config_settings:precompile")),
     PRECOMPILE_SOURCE_RETENTION = str(Label("//python/config_settings:precompile_source_retention")),
     PYC_COLLECTION = str(Label("//python/config_settings:pyc_collection")),
+    PYTHON_IMPORT_ALL_REPOSITORIES = str(Label("//python/config_settings:experimental_python_import_all_repositories")),
     PYTHON_SRC = str(Label("//python/bin:python_src")),
     PYTHON_VERSION = str(Label("//python/config_settings:python_version")),
     PYTHON_VERSION_MAJOR_MINOR = str(Label("//python/config_settings:python_version_major_minor")),