Python/ifconfig: T1557: bugfix removing Q-in-Q VLAN interfaces

VLAN interfaces have not been removed "in order". What does it mean? We need to
delete Q-in-Q interfaces prior to deleting the underlaying VLAN interface
(vif-s). This was not the case and that triggered an exception that a non
existing interface was about to be removed.

Tested using adding and deleting the following config:

set interfaces ethernet eth2 address 192.0.2.1/24
set interfaces ethernet eth2 description "VyOS bonding"
set interfaces ethernet eth2 disable-link-detect
set interfaces ethernet eth2 mac 00:91:00:00:00:01
set interfaces ethernet eth2 mtu 9000
set interfaces ethernet eth2 vif-s 100 address 192.168.10.1/24
set interfaces ethernet eth2 vif-s 100 description "802.1ad service VLAN 100"
set interfaces ethernet eth2 vif-s 100 mtu 1500
set interfaces ethernet eth2 vif-s 100 mac 00:91:00:00:00:02
set interfaces ethernet eth2 vif-s 100 vif-c 110 address "192.168.110.1/24"
set interfaces ethernet eth2 vif-s 100 vif-c 110 description "client VLAN 110"
set interfaces ethernet eth2 vif-s 100 vif-c 120 address "192.168.120.1/24"
set interfaces ethernet eth2 vif-s 100 vif-c 120 description "client VLAN 120"
set interfaces ethernet eth2 vif-s 100 vif-c 130 address "192.168.130.1/24"
set interfaces ethernet eth2 vif-s 100 vif-c 130 description "client VLAN 130"
set interfaces ethernet eth2 vif 400 address 192.168.40.1/24
set interfaces ethernet eth2 vif 400 description "802.1q VLAN 400"
set interfaces ethernet eth2 vif 400 mtu 1500
set interfaces ethernet eth2 vif 400 mac 00:91:00:00:00:03

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