Move repository to openstack org.

The upstream repo is now:

  https://github.com/openstack/python-ceilometerclient

Update the README and .gitreview to reflect that.

Change-Id: I573584457a626174b5115a999181ed82dd2abf9a
Fix tests

Change-Id: I8c6a1c4bc4dec052fbb5f2544f519253bc8be143
Signed-off-by: Julien Danjou <julien@danjou.info>
Merge "Move repository to openstack org."
Add support for metadata query

Change-Id: Iade319df3ab503e392f4216b2531b20642a20c31