Remove legacy filtering code from sqla model base

Change-Id: Ida6c2b64896694b0789f9d0606c778bcdc42fe23
Test added for sqla MutableDict

Change-Id: I3365bb958604bc8900af7bf1950185d4277b42f5
Test added for sqla MutableList

Change-Id: Id439d6f6da67899834ecdf0544bde9adf4215f66