Merge pull request #2722 from matrix-org/rav/delete_device_on_logout

synapse/handlers/auth.py

synapse/handlers/deactivate_account.py

synapse/handlers/device.py

synapse/handlers/set_password.py

synapse/module_api/__init__.py

synapse/push/pusherpool.py

synapse/rest/client/v1/admin.py

synapse/rest/client/v1/logout.py

synapse/rest/client/v2_alpha/account.py

synapse/server.py

synapse/server.pyi

synapse/storage/registration.py