One can not <TAB> complete the BGP peer-groups when working inside the VRF tree
To reproduce:
```
set vrf name red protocols bgp neighbor 100.64.151.251 peer-group 'PG-VYOS-123'
set vrf name red protocols bgp neighbor 100.64.151.251 update-source 'dum0'
set vrf name red protocols bgp neighbor 100.64.151.254 peer-group 'PG-VYOS-123'
set vrf name red protocols bgp neighbor 100.64.151.254 update-source 'dum0'
set vrf name red protocols bgp peer-group PG-VYOS-123 address-family ipv4-unicast nexthop-self
set vrf name red protocols bgp peer-group PG-VYOS-123 bfd
set vrf name red protocols bgp peer-group PG-VYOS-123 capability dynamic
set vrf name red protocols bgp peer-group PG-VYOS-123 remote-as 'internal'
```
`set vrf name red protocols bgp neighbor 100.64.151.222 peer-group <TAB>` does not list PG-VYOS-123 as possible completion