Merge pull request #2976 from matrix-org/erikj/replication_registry

synapse/federation/federation_server.py

synapse/handlers/device.py

synapse/handlers/devicemessage.py

synapse/handlers/directory.py

synapse/handlers/e2e_keys.py

synapse/handlers/presence.py

synapse/handlers/profile.py

synapse/handlers/receipts.py

synapse/handlers/typing.py

synapse/server.py

tests/handlers/test_directory.py

tests/handlers/test_profile.py