Merge pull request #1857 from matrix-org/erikj/device_list_stream

synapse/app/federation_sender.py

synapse/app/synchrotron.py

synapse/federation/federation_client.py

synapse/federation/federation_server.py

synapse/federation/transaction_queue.py

synapse/federation/transport/client.py

synapse/federation/transport/server.py

synapse/handlers/device.py

synapse/handlers/e2e_keys.py

synapse/handlers/sync.py

synapse/replication/resource.py

synapse/replication/slave/storage/devices.py

synapse/rest/client/v2_alpha/sync.py

synapse/storage/__init__.py

synapse/storage/_base.py

synapse/storage/devices.py

synapse/storage/end_to_end_keys.py

synapse/storage/schema/delta/40/device_list_streams.sql

synapse/streams/events.py

synapse/types.py