smoketest: vrrp: delete VLAN interfaces in tearDown()
smoketest: vrrp: delete VLAN interfaces in tearDown()

(cherry picked from commit 3fb6f5a966c57cb0936b35c13655f0b3f36483c4)

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