CRITICAL FIX

The teardown method used to delete ALL LOAD BALANCERS in your account.
    Though this is not necessarily a bad thing on its own, it can really
    burn you if you happen to run the integration tests in a staging
    environment that you care about.

    The fix makes all assertions that are based on modifications to load
    balancers refer to the fixture that is created in the setup method.
    There was repeated code that was doing the same thing as the setup
    method--this code also cleans this up.

    NOTE: THIS IS JUST A FIX TO elb/test_connection.py. All of the
    integration tests need to be looked at with this issue in mind.