Bridge operators can be reasonably sure that obfsproxy works for them since they see the `Registered server transport` log message. OTOH, clients can't be sure whether their obfsproxy works or whether they connected to a bridge with obfsproxy. I think we should add PT information to one of the "connected to bridge" log messages. Specifically, to: ``` log_notice(LD_DIR, "Learned fingerprint %s for bridge %s" ``` or to ``` log_notice(LD_DIR, "new bridge descriptor '%s' (%s): %s" ``` IIUC the latter will appear in the logs everytime we connect to a bridge, even if we knew the bridge fingerprint.