Move to the oslo.middleware library

Move to the oslo.middleware library

This patch moves Cinder to using olso.middleware, updates us so
we are using the oslo_middleware namespace and syncs the latest
middleware code from oslo-incubator to support grenade jobs.

The details for the middleware sync from oslo-incubator are as follows:

Current HEAD in OSLO:
---------------------
commit e589dde0721a0a67e4030813e582afec6e70d042
Date:  Wed Feb 18 03:08:12 2015 +0000
Merge "Have a little fun with release notes"

Changes merged with this patch:
---------------------
__init__.py
  4ffc4c87 - Add middleware.request_id shim for Kilo
  4504e4f4 - Remove middleware

catch_errors.py
  a01a8527 - Use oslo_middleware instead of deprecated oslo.middleware
  ce8f8fa4 - Add middleware.catch_errors shim for Kilo
  4504e4f4 - Remove middleware
  5d40e143 - Remove code that moved to oslo.i18n
  76183592 - add deprecation note to middleware
  463e6916 - remove oslo log from middleware
  fcf517d7 - Update oslo log messages with translation domains

request_id.py
  a01a8527 - Use oslo_middleware instead of deprecated oslo.middleware
  66d8d613 - Fix oslo.middleware deprecation error
  4ffc4c87 - Add middleware.request_id shim for Kilo
  4504e4f4 - Remove middleware
  76183592 - add deprecation note to middleware
  d7bd9dc3 - Don't store the request ID value in middleware as class variable

Some notes on this change.  It is based on the change made in Nova:
https://review.openstack.org/#/c/130771 and is the recommended method
for cleaning up the unused portions of middleware from oslo-incubator,
moving to the oslo.middleware library and not breaking grenade in the
gate.

Change-Id: Ia99ab479cb8ef63a0db1a1208cc2501abba6132c