Move canAcceptConnections check from ProcessStartupPacket to caller.
The check is not about processing the startup packet, so the calling
function seems like a more natural place. I'm also working on a patch
that moves 'canAcceptConnections' out of the Port struct, and this
makes that refactoring more convenient.
Reviewed-by: Tristan Partin
Discussion: https://www.postgresql.org/message-id/
7a59b073-5b5b-151e-7ed3-
8b01ff7ce9ef@iki.fi