Sync latest cfg and log from oslo-incubator

Main cfg change is:

  c5984ba Move logging config options into the log module

Logging changes include:

  c5984ba Move logging config options into the log module
  751c35b Verbose should not enable debug level logging
  edcdd25 Improve millisecond logging
  9e5912f Fix pep8 E125 errors.
  edf14e0 Enable millisecond logging by default
  9b81289 Allow nova and others to override some logging defaults
  90ada0e update deprecated stanza
  efba202 Adjust the logging_context_format_string.
  c8cf6f7 move nova.common.deprecated to openstack-common

Fixes bug #989269

Use new LOG.deprecated() in place of cinder.common.deprecated.warn().

Also pull this cinder/context.py change from nova:

  ce098cc Add user/tenant shim to RequestContext

to avoid issues caused by a s/user_id/user/ change in the context
logging format.

Change-Id: I3913ea54465658d93dc56e014dfe5d911b0541d6
Update cinder-volume to enable multi volume support

* Added the service wrapper for multi binscripts
* Added a service_name to manager
* Added the configuration wrapper so the impls do not need
  to know if they are accessing config values from a option
  group or from the DEFAULT group
* Updated drivers to use the new configuration wrapper
* Added an example config set for multi backend
* Modified service to comply w/ common
* Added get_volume_stats to iscsi
* Added config for volume_backend_name

implements blueprint multi-volume-backends

Change-Id: Idb86ac5f1c06b9cd5061bef6a24f17727e9a58c1
Fix PEP8 violation (again)

Change-Id: I91d8d4d879bfdffffe982aafa228c374506921df
Merge "Sync latest cfg and log from oslo-incubator"
Fix undef function call in test_migrations for py26

unittest does not have this function until later. This uses the already
imported cinder.test.skip_unless to accomplish the same result without
outputted error.

Change-Id: Id20add5a0d41e5d8cf6f8bc6aa0e547e5e386dab
Merge "Fix PEP8 violation (again)"
Merge "Update cinder-volume to enable multi volume support"
Merge "Fix undef function call in test_migrations for py26"