Update the oslo code before importing a new module

Note:
- there are some new oslo dependencies pulled in.
- "six" has been added to the requirements.
- rpc messages now have a "namespace" that conflicted with
  the metric namespace.

part of blueprint heat-manage
Change-Id: I92c6b91a28ca0380d13f0a3ba1544b9d517d74a8
Merge "Update the oslo code before importing a new module"