conn: Do not call shutdown right away
conn: Do not call shutdown right away

The shutdown needs to be called in a way that cannot trigger the shutdown
callback of other connections being called.

aji/ircd-micro,aji/ircd-micro,atheme/tethys,aji/ircd-micro,atheme/tethys,atheme/tethys,atheme/tethys,aji/ircd-micro