Merge pull request #949 from matrix-org/rav/update_devices

synapse/handlers/auth.py

synapse/handlers/device.py

synapse/http/server.py

synapse/rest/client/v1/login.py

synapse/rest/client/v2_alpha/devices.py

synapse/rest/client/v2_alpha/register.py

synapse/storage/devices.py

synapse/storage/registration.py

...se/storage/schema/delta/33/access_tokens_device_index.sql

...pse/storage/schema/delta/33/refreshtoken_device_index.sql

tests/handlers/test_device.py

tests/rest/client/v2_alpha/test_register.py

tests/storage/test_devices.py