Fix up logcontexts

synapse/api/auth.py

synapse/app/homeserver.py

synapse/crypto/keyring.py

synapse/federation/federation_server.py

synapse/federation/transaction_queue.py

synapse/handlers/_base.py

synapse/handlers/events.py

synapse/handlers/federation.py

synapse/handlers/presence.py

synapse/handlers/register.py

synapse/handlers/room.py

synapse/handlers/sync.py

synapse/http/server.py

synapse/notifier.py

synapse/push/__init__.py

synapse/push/pusherpool.py

synapse/rest/client/v2_alpha/account_data.py

synapse/rest/client/v2_alpha/tags.py

synapse/storage/_base.py

synapse/storage/events.py