PEP-8 pulp.server.managers.consumer.group.query.

Also PEP-8 its test module.
Build updates for Fedora 21.

This adds fc21 and removes fc19 from the 2.6 build. There are also two small
specfile fixes.
update dev setup docs

Some steps were broken and/or not needed anymore due to changes in Pulp.
Merge pull request #1432 from beav/devdocs

update dev setup docs
Merge pull request #1428 from beav/f21-building

Build updates for Fedora 21.
Merge remote-tracking branch 'origin/2.6-dev'
Merge branch 'pep8-consumer_group_query'