Change Cache to not use *args in its interface

synapse/storage/__init__.py

synapse/storage/_base.py

synapse/storage/directory.py

synapse/storage/event_federation.py

synapse/storage/events.py

synapse/storage/keys.py

synapse/storage/presence.py

synapse/storage/push_rule.py

synapse/storage/registration.py

synapse/storage/roommember.py

tests/storage/test__base.py