[Pulp-list] unit tests functional again

[Mike McCune]

We were using a mongo connection *PER* API class when in fact you only 
need one per application.

Each:

     pymongo.Connection()

is a pointer to a connection pool and by using one per API class we were 
creating too many pools to the DB.  Switching to on pool and Connection 
solved the problem.

Mike
-- 
Mike McCune
mmccune AT redhat.com
Red Hat Engineering       | Portland, OR
Systems Management        | 650.254.4248