caddyhttp: Print actual listener address in log message (closes #2992)
caddyhttp: Print actual listener address in log message (closes #2992)

Needed if port is 0, thus chosen by OS

mholt/caddy,abiosoft/caddy,l3dlp/caddy,l3dlp/caddy,mholt/caddy,l3dlp/caddy,abiosoft/caddy