Fixes volume related unit tests.
Fixes non-sortable None items.
Fixes __getattr__ infinite recursion.
Fixes is_dict_like method. Dicts in python 3.4 do not
have the 'has_key' method.
Partially Implements: blueprint goal-python35
Change-Id: I97efc09f7657436f706b08e0b2795f0e59ac1dcd