[Pulp-list] Agent decoupling

[Jay Dobies]

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As part of the bind refactor, I'm adding test cases for the bind API
call. Currently, the agent call is tightly coupled into the API call:

def bind(self, id, repoid):
[snip]
        agent = Agent(id, async=True)
        repolib = agent.Repo()
        repolib.update()

That doesn't let us mock out the qpidd call, so if we had unit tests for
any non-async agent calls they would fail because the receiver wasn't
present.

It's best to just mock out something like a message bus connection in a
unit test (the tests for the Agent itself can be handled separately), so
I added a factory method to agent.py.

Going forward, instead of instantiating an Agent object directly in the
API, use the factory method (agent.retrieve_agent()). That way we can
monkey patch that method in the API unit test to return a mock so we can
track that the API methods are invoking the correct methods on an agent,
just not doing them over a live bus.

That factory method currently exists in the bind-refactor branch and
should be in master in the next few days.

- -- 
Jay Dobies
RHCE# 805008743336126
Freenode: jdob
http://pulpproject.org
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