All the information needed is already in the `instance_map`, so use that instead of passing the hostname / IP & port manually for each replication request. This consolidates logic for future improvements of using e.g. UNIX sockets for workers.
full_user_id
profiles
user_filters
traceback.format_exception(...)
state
state_group
app_service_config_files
ConfigError
StrSequence
HomeServer
trial
_trial_temp/test.log
HomeServerConfig