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/class.go

@@ -47,6 +47,7 @@ type ClassStatistics struct {
 	Basic   *GnetStatsBasic
 	Queue   *GnetStatsQueue
 	RateEst *GnetStatsRateEst
+	BasicHw *GnetStatsBasic // Hardward statistics added in kernel 4.20
 }
 
 // NewClassStatistics Construct a ClassStatistics struct which fields are all initialized by 0.
@@ -55,6 +56,7 @@ func NewClassStatistics() *ClassStatistics {
 		Basic:   &GnetStatsBasic{},
 		Queue:   &GnetStatsQueue{},
 		RateEst: &GnetStatsRateEst{},
+		BasicHw: &GnetStatsBasic{},
 	}
 }