Synchronize code from oslo

Use commit 8c964a25a0904f4153eb4fbcfb3cfd4d8a357e0c
Do not import openstack.common.log in strutils
(Mon Apr 29 11:13:51 2013 +0300)

Changes:
    8c964a2 Do not import openstack.common.log in strutils
    e700d92 Replaces standard logging with common logging
    47e9e98 Fix the co-authored-by processing.
    6e8b9ba Include Co-authored-by entries in AUTHORS.
    547ab34 Fix Copyright Headers - Rename LLC to Foundation
    2cb8e45 support ISO 8601 micro-second precision

Change-Id: Ida31e60ecac5ba89e72a1d8b0a79fd608ad19092
Merge "Synchronize code from oslo"