Set secondary ip address to vti interface cause interface disable.
To reproduce, initial configuration
```
set interfaces ethernet eth1 address '2001:db8::2/64'
set interfaces ethernet eth1 address '192.0.2.2/30'
set interfaces ethernet eth1 ipv6 disable-forwarding
set interfaces ethernet eth1 mtu '1540'
set interfaces vti vti2 address '10.0.0.2/30'
set vpn ipsec esp-group ESP-GRP-VTI compression 'disable'
set vpn ipsec esp-group ESP-GRP-VTI lifetime '1800'
set vpn ipsec esp-group ESP-GRP-VTI mode 'tunnel'
set vpn ipsec esp-group ESP-GRP-VTI pfs 'enable'
set vpn ipsec esp-group ESP-GRP-VTI proposal 1 encryption 'aes256'
set vpn ipsec esp-group ESP-GRP-VTI proposal 1 hash 'sha1'
set vpn ipsec ike-group IKE-GRP-VTI ikev2-reauth 'no'
set vpn ipsec ike-group IKE-GRP-VTI key-exchange 'ikev1'
set vpn ipsec ike-group IKE-GRP-VTI lifetime '3600'
set vpn ipsec ike-group IKE-GRP-VTI proposal 1 dh-group '2'
set vpn ipsec ike-group IKE-GRP-VTI proposal 1 encryption 'aes256'
set vpn ipsec ike-group IKE-GRP-VTI proposal 1 hash 'sha1'
set vpn ipsec interface 'eth1'
set vpn ipsec site-to-site peer 192.0.2.1 authentication mode 'pre-shared-secret'
set vpn ipsec site-to-site peer 192.0.2.1 authentication pre-shared-secret 'SeCrEt'
set vpn ipsec site-to-site peer 192.0.2.1 ike-group 'IKE-GRP-VTI'
set vpn ipsec site-to-site peer 192.0.2.1 local-address '192.0.2.2'
set vpn ipsec site-to-site peer 192.0.2.1 vti bind 'vti2'
set vpn ipsec site-to-site peer 192.0.2.1 vti esp-group 'ESP-GRP-VTI'
```
Add secondary address to vti2 interface:
```
vyos@r1-roll:~$ show int vti
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
vti2 10.0.0.2/30 u/u
vyos@r1-roll:~$ conf
[edit]
vyos@r1-roll# set interfaces vti vti2 address 100.64.222.1/24
[edit]
vyos@r1-roll# commit
[edit]
vyos@r1-roll# run show interfaces vti
Codes: S - State, L - Link, u - Up, D - Down, A - Admin Down
Interface IP Address S/L Description
--------- ---------- --- -----------
vti2 10.0.0.2/30 A/D
100.64.222.1/24
```