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/proc_event_linux.go

@@ -63,15 +63,6 @@ type ExitProcEvent struct {
 	ParentTgid  uint32
 }
 
-type ExitProcEvent2 struct {
-	ProcessPid  uint32
-	ProcessTgid uint32
-	ExitCode    uint32
-	ExitSignal  uint32
-	ParentPid   uint32
-	ParentTgid  uint32
-}
-
 func (e *ExitProcEvent) Pid() uint32 {
 	return e.ProcessPid
 }