Restore the python/pip.bzl#pip_repositories function

It is called from rules_docker so we have to leave a placeholder until rules_docker is fixed and all users update

Author: Alex Eagle

examples/legacy_pip_import/README.md

@@ -1,6 +1,6 @@
 # LEGACY pip example
 
-This feature has been replaced by the pip_install rule, please see the latest release notes to migrate.
+This feature has been replaced by the pip_install rule, please see the rules_python 0.1 release notes to migrate.
 
 This shows how you can point Bazel at your requirements.txt file to get dependencies automatically installed.
 

python/legacy_pip_import/pip.bzl

@@ -140,4 +140,4 @@ def pip3_import(**kwargs):
 
 def pip_repositories():
     # buildifier: disable=print
-    print("DEPRECATED: the pip_import rule has been replaced with pip_install, please see release notes")
+    print("DEPRECATED: the pip_import rule has been replaced with pip_install, please see rules_python 0.1 release notes")

python/pip.bzl

@@ -56,8 +56,12 @@ def pip_install(requirements, name = "pip", **kwargs):
         **kwargs
     )
 
+def pip_repositories():
+    # buildifier: disable=print
+    print("DEPRECATED: the pip_repositories rule has been replaced with pip_install, please see rules_python 0.1 release notes")
+
 def pip_import(**kwargs):
     fail("=" * 79 + """\n
-    pip_import has been replaced with pip_install, please see the release notes.
+    pip_import has been replaced with pip_install, please see the rules_python 0.1 release notes.
     To continue using it, you can load from "@rules_python//python/legacy_pip_import:pip.bzl"
     """)