Update github.com/vishvananda/netlink to v1.2.0-beta

Latest version fixes a segfault when used on some ppp setup

Signed-off-by: Dominique Martinet <dominique.martinet@atmark-techno.com>

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

@@ -180,14 +180,30 @@ func RouteAdd(route *Route) error {
 	return ErrNotImplemented
 }
 
+func RouteAppend(route *Route) error {
+	return ErrNotImplemented
+}
+
 func RouteDel(route *Route) error {
 	return ErrNotImplemented
 }
 
+func RouteGet(destination net.IP) ([]Route, error) {
+	return nil, ErrNotImplemented
+}
+
 func RouteList(link Link, family int) ([]Route, error) {
 	return nil, ErrNotImplemented
 }
 
+func RouteListFiltered(family int, filter *Route, filterMask uint64) ([]Route, error) {
+	return nil, ErrNotImplemented
+}
+
+func RouteReplace(route *Route) error {
+	return ErrNotImplemented
+}
+
 func XfrmPolicyAdd(policy *XfrmPolicy) error {
 	return ErrNotImplemented
 }