Sync latest cfg and log from oslo-incubator

Changes include:

  c5984ba Move logging config options into the log module
  751c35b Verbose should not enable debug level logging
  edcdd25 Improve millisecond logging
  a8973c5 Revert "Support lookup of value using "group.key""

The most significant of these changes is defaulting to the WARNING log
level which was discussed on openstack-dev:

  http://lists.openstack.org/pipermail/openstack-dev/2013-January/004223.html

This is behaviour already documented in doc/source/configuring.rst at
least.

Fixes bug #989269

DocImpact

Change-Id: I8ed9107193a811f50ecfd9b34e99e933774405ab
Merge "Sync latest cfg and log from oslo-incubator"