vlan: restore leftover eth7 MTU in vlan_mtu_from_parent
Possibly due to the manual reboot happening in test @vlan_mtu_from_parent
, eth7
device was left with option 802-3-ethernet.mtu 9000
even after cleanup. That caused ethernet_keep_mtu_on_reboot
to count one more device with MTU 9000 than expected, leading to failure.
@RunTests:vlan_mtu_from_parent,ethernet_keep_mtu_on_reboot