Make workers report to master for user ip updates

synapse/app/client_reader.py

synapse/app/media_repository.py

synapse/app/synchrotron.py

synapse/app/user_dir.py

synapse/replication/slave/storage/client_ips.py

synapse/replication/tcp/client.py

synapse/replication/tcp/commands.py

synapse/replication/tcp/protocol.py

synapse/replication/tcp/resource.py