Backport commit 1440817 from trunk:

Add new DNS driver for Gandi.net provider.

Also perform pep8 cleanup on the existing compute driver tests.

Contributed by John Carr, part of LIBCLOUD-281.


git-svn-id: https://svn.apache.org/repos/asf/libcloud/branches/0.12.x@1440820 13f79535-47bb-0310-9956-ffa450edef68