Revert "Use netlink.SetPromiscOn instead of iproute2 command"

vendor/github.com/vishvananda/netlink/addr.go

@@ -11,13 +11,11 @@ import (
 type Addr struct {
 	*net.IPNet
 	Label string
-	Flags int
-	Scope int
 }
 
 // String returns $ip/$netmask $label
 func (a Addr) String() string {
-	return strings.TrimSpace(fmt.Sprintf("%s %s", a.IPNet, a.Label))
+	return fmt.Sprintf("%s %s", a.IPNet, a.Label)
 }
 
 // ParseAddr parses the string representation of an address in the