cleanups to startup code and goroutine code

util/util.go

@@ -13,7 +13,6 @@
 package util
 
 import (
-	"net"
 	"regexp"
 	"strings"
 	"time"
@@ -172,17 +171,6 @@ func Map[A, B any](in []A, fn func(A) B) []B {
 	return rc
 }
 
-// MyIPAddress returns the local IP address of this machine.
-func MyIPAddress() (net.IP, error) {
-	conn, err := net.Dial("udp", "8.8.8.8:80")
-	if err != nil {
-		return nil, err
-	}
-	defer conn.Close()
-	localAddr := conn.LocalAddr().(*net.UDPAddr)
-	return localAddr.IP, nil
-}
-
 // IIF is an "immediate-if" function returning its second argument if the first one is true, the third one if not.
 func IIF[A any](expr bool, v1, v2 A) A {
 	if expr {