Synnefo

cyclades: Fix userdata limit check

Argument passed to PublicKeyPair.user_limit_exceeded() was a dict
rather that a string (user uuid). Django would happily convert it
to a string and pass it through to the database query.

Also fix a minor bug in tests.

ci: kamaki config.get_global method is deprecated

Use the newer config.get("global", ..) syntax.
Fallback to the old one for older version of kamaki.

ci: Improve pep8 script

Rewrite the script in python.
Invoke pep8 for a list of files given in the command line.
Exclude files which are not python ones (their names don't
end with .py) or are not real files (i.e. have been removed
during the last commit).

pithos: Update/fix sqlite backend module

snf-deploy: Add fabric as a dependency