update github.com/vishvananda/netlink to v1.3.0

There seems to be one change[1] which breaks our tests, the route Dst field
is no longer nil for a default route but rather the empty ipnet, i.e.
0.0.0.0/0 and ::/0 so fix that up in our code.

[1] https://github.com/vishvananda/netlink/pull/852

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

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

@@ -6,14 +6,16 @@ import (
 
 // Protinfo represents bridge flags from netlink.
 type Protinfo struct {
-	Hairpin      bool
-	Guard        bool
-	FastLeave    bool
-	RootBlock    bool
-	Learning     bool
-	Flood        bool
-	ProxyArp     bool
-	ProxyArpWiFi bool
+	Hairpin       bool
+	Guard         bool
+	FastLeave     bool
+	RootBlock     bool
+	Learning      bool
+	Flood         bool
+	ProxyArp      bool
+	ProxyArpWiFi  bool
+	Isolated      bool
+	NeighSuppress bool
 }
 
 // String returns a list of enabled flags
@@ -47,6 +49,12 @@ func (prot *Protinfo) String() string {
 	if prot.ProxyArpWiFi {
 		boolStrings = append(boolStrings, "ProxyArpWiFi")
 	}
+	if prot.Isolated {
+		boolStrings = append(boolStrings, "Isolated")
+	}
+	if prot.NeighSuppress {
+		boolStrings = append(boolStrings, "NeighSuppress")
+	}
 	return strings.Join(boolStrings, " ")
 }