Synchronize code from oslo

Use commit 376d1aaef9928a0cacb6ff8361b7b5003cad1e0a
'Merge "Update DB maintainers"'
by jenkins
on Tue Aug 20 12:08:26 2013 +0000

Changes:
- Ibf3c56e4baa6ad83e2b95a948787e9d02cf074d4 BaseException.message is deprecated since Python 2.6
- I24ffad9ab7852be44e5d6c8805aa0a47647e21cc Don't attempt to patch eventlet without the patch
- I838559f6f308e4a0c255af7bc27cdc669c5cf5f3 Ensure install_venv works behind firewalls

Change-Id: I70182bd4e6611ee6da58d2772767888608c0f80c
Merge "Synchronize code from oslo"