Update charm-helpers-hooks.yaml and sync ch

Using the new version of the sync tool which removes the charmhelpers
directory before syncing, run charm helpers sync to find any unexpected
missing dependencies.

Change-Id: I634c89e87918f56a8db89bb888c00b9032c69a17

charm-helpers-hooks.yaml

@@ -15,4 +15,4 @@ include:
         - utils
     - contrib.charmsupport
     - contrib.hardening|inc=*
-    - fetch.python.packages
+    - fetch.python

hooks/charmhelpers/contrib/python.py

@@ -0,0 +1,21 @@
+# Copyright 2014-2019 Canonical Limited.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#  http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from __future__ import absolute_import
+
+# deprecated aliases for backwards compatibility
+from charmhelpers.fetch.python import debug  # noqa
+from charmhelpers.fetch.python import packages  # noqa
+from charmhelpers.fetch.python import rpdb  # noqa
+from charmhelpers.fetch.python import version  # noqa