Merge remote-tracking branch 'origin/develop' into rav/refactor_received_pdu

synapse/api/constants.py

synapse/app/appservice.py

synapse/app/client_reader.py

synapse/app/federation_reader.py

synapse/app/federation_sender.py

synapse/app/homeserver.py

synapse/app/media_repository.py

synapse/app/pusher.py

synapse/app/synchrotron.py

synapse/config/logger.py

synapse/handlers/auth.py

synapse/handlers/identity.py

synapse/handlers/sync.py

synapse/http/servlet.py

synapse/python_dependencies.py

synapse/replication/slave/storage/deviceinbox.py

synapse/rest/client/v1/login.py

synapse/rest/client/v2_alpha/account.py

synapse/rest/client/v2_alpha/register.py

synapse/storage/deviceinbox.py