Unexpected vrf configuration for the default route.
When we use rfc3768 and this node as a master.
To reproduce:
```
set interfaces ethernet eth1 address 'dhcp'
set high-availability vrrp group test interface 'eth1'
set high-availability vrrp group test rfc3768-compatibility
set high-availability vrrp group test virtual-address '172.20.110.111/24'
set high-availability vrrp group test virtual-address '172.20.110.15/24'
set high-availability vrrp group test vrid '1'
```
Vtysh config (**unexpected vrf value**):
```
service integrated-vtysh-config
!
vrf eth1v1
ip route 0.0.0.0/0 192.168.101.1 eth1 tag 210 210
exit-vrf
!
line vty
!
```
Expected behavior - to see default route without vrf.
Tested on: 1.3.0-rc1 and 1.4-rolling-202103070218