it's not super-important, generates lots of warnings and seems to be absent in other copies of vis.h scattered on other OpenBSD -portable software (tmux for instance.)

it's wrong to pass the pid instead of the peerid and the peerid is not important anyway for the VERBOSE request.

fix typo in previous commit where `0' was used instead of peerid. Spotted by cage, thanks!

while here also fix the imsg retrival loop

meant to be used from kamictl to dump all the opened fid by every connection.

this saves us from the small chance that a client accepted before reconf uses the flags from a listener post reconf.

drop connections in the handshake phase: the listener from where they've been accepted is now being replaced and its id is no more meaningful. Clients for which we have already sent an auth request are kept.