[MERGE] Fixing errors found with ReviewBoard integration

[Stephen Gallagher]

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The attached patch resolves the following issues that were interfering
with FAS integration in ReviewBoard.


django/auth/middleware.py:
    If there are other authentication mechanisms in place, don't throw
    an exception on a missing session_id

django/auth/models.py:
    connection.group_list returns a tuple, the second entry of which is
    the dict that we intended to be accessing. Trying to call
    gl['groups'] throws a KeyError

    userinfo in _get_name() contains a double-level dictionary. When
    requesting 'human_name', we need to access the 'person' dictionary
    first or we throw a KeyError

- -- 
Stephen Gallagher
RHCE 804006346421761

Delivering value year after year.
Red Hat ranks #1 in value among software vendors.
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