use listen to ensure the port is free (kubernetes#6990) (kubernetes#7467)

Co-authored-by: boxjan <[email protected]>

Author: 2 people

internal/net/net.go

@@ -29,12 +29,12 @@ func IsIPV6(ip _net.IP) bool {
 
 // IsPortAvailable checks if a TCP port is available or not
 func IsPortAvailable(p int) bool {
-	conn, err := _net.Dial("tcp", fmt.Sprintf(":%v", p))
+	ln, err := _net.Listen("tcp", fmt.Sprintf(":%v", p))
 	if err != nil {
-		return true
+		return false
 	}
-	defer conn.Close()
-	return false
+	defer ln.Close()
+	return true
 }
 
 // IsIPv6Enabled checks if IPV6 is enabled or not and we have