it's awkward to call it with the address of the imsgev struct inside the ctl_conn struct. Just relay the info to every client in monitor mode. After all, if a client is in monitor mode *and* issues commands, it's not strange that they're echoed back (note that this is currently impossible, the command line client can either issue commands or be in monitor mode.)

this pings all the "interesting" events to clients that issued a IMSG_CTL_MONITOR, except to the one that generated such event.