vxlan: T2241: fix falling out of bridge when changing settings
vxlan: T2241: fix falling out of bridge when changing settings

Previously, the interface was always deleted and recreated, which
removed it from the bridge.
- always re-add the interface back to any bridge it is part of

vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x,vyos/vyos-1x