Performing a mongo $set: {} will fail on mongo 2.6+: https://jira.mongodb.org/browse/SERVER-12266

For now fix this only for the failing test case as it should not be an issue in the field for other
locations.  Long term this should be fixed by the move to mongoengine.
update test to be python 2.6 compatible
PEP-8 pulp.server.managers.repo.publish and tests.
PEP-8 pulp.server.managers.repo.sync and tests.
PEP-8 pulp.server.managers.repo.cud and its tests.
Upgrade python-amqp to 1.4.6
Merge branch 'mongo-behavior-change' into 2.5-testing
Merge pull request #1409 from bmbouter/upgrade-py-amqp-to-1-4-6

Upgrade python-amqp to 1.4.6
Merge branch '2.6-dev'
Merge branch '2.5-testing' into 2.6-dev
Merge branch '2.6-dev'
Merge branch 'test-none-check' into 2.6-dev
Resolve merge conflicts
Automatic commit of package [python-amqp] minor release [1.4.6-1].
Merge branch '2.6-dev'
Merge branch 'pep8-managers_repo_publish'
Merge branch 'pep8-managers_repo_cud'

Conflicts:
	server/test/unit/server/managers/repo/test_cud.py
Merge branch 'pep8-managers_repo_sync'
1171509 - FastForwardXmlFileContext was sometimes finding the wrong file and was not cleaning up after itself.

Add 2.5.0 -> 2.5.1 upgrade instructions
Add a link to our branching inspiration.