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/handle_linux.go

@@ -15,7 +15,7 @@ var pkgHandle = &Handle{}
 // Handle is an handle for the netlink requests on a
 // specific network namespace. All the requests on the
 // same netlink family share the same netlink socket,
-// which gets released when the handle is deleted.
+// which gets released when the handle is Close'd.
 type Handle struct {
 	sockets      map[int]*nl.SocketHandle
 	lookupByDump bool
@@ -107,6 +107,21 @@ func (h *Handle) GetSocketReceiveBufferSize() ([]int, error) {
 	return results, nil
 }
 
+// SetStrictCheck sets the strict check socket option for each socket in the netlink handle. Returns early if any set operation fails
+func (h *Handle) SetStrictCheck(state bool) error {
+	for _, sh := range h.sockets {
+		var stateInt int = 0
+		if state {
+			stateInt = 1
+		}
+		err := unix.SetsockoptInt(sh.Socket.GetFd(), unix.SOL_NETLINK, unix.NETLINK_GET_STRICT_CHK, stateInt)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
 // NewHandleAt returns a netlink handle on the network namespace
 // specified by ns. If ns=netns.None(), current network namespace
 // will be assumed
@@ -136,14 +151,22 @@ func newHandle(newNs, curNs netns.NsHandle, nlFamilies ...int) (*Handle, error)
 	return h, nil
 }
 
-// Delete releases the resources allocated to this handle
-func (h *Handle) Delete() {
+// Close releases the resources allocated to this handle
+func (h *Handle) Close() {
 	for _, sh := range h.sockets {
 		sh.Close()
 	}
 	h.sockets = nil
 }
 
+// Delete releases the resources allocated to this handle
+//
+// Deprecated: use Close instead which is in line with typical resource release
+// patterns for files and other resources.
+func (h *Handle) Delete() {
+	h.Close()
+}
+
 func (h *Handle) newNetlinkRequest(proto, flags int) *nl.NetlinkRequest {
 	// Do this so that package API still use nl package variable nextSeqNr
 	if h.sockets == nil {