Display the BGP ipv4 unicast configuration under "address-family ipv4 unicast".

Display the BGP ipv4 unicast configuration under "address-family ipv4 unicast".

Signed-off-by: Daniel Walton <dwalton@cumulusnetworks.com>
Reviewed-by:   Donald Sharp <sharpd@cumulusnetworks.com>
Ticket: CM-6739

Before
router bgp 10
 bgp router-id 10.1.1.1
 bgp log-neighbor-changes
 no bgp default ipv4-unicast
 network 9.9.9.9/32
 neighbor 10.1.1.2 remote-as 10
 neighbor 10.1.1.2 shutdown
 neighbor 10.1.1.2 update-source lo
 neighbor 10.1.1.2 advertisement-interval 1
 neighbor 10.1.1.2 timers connect 10
 neighbor 10.1.1.2 activate
 neighbor 10.1.1.2 next-hop-self
 neighbor 10.1.1.2 route-map BAR in
 neighbor 10.1.1.2 route-map FOO out
 neighbor 20.1.2.2 remote-as 20
 neighbor 20.1.2.2 shutdown
 neighbor 20.1.2.2 advertisement-interval 1
 neighbor 20.1.2.2 timers connect 10
 neighbor 20.1.2.2 activate
 neighbor 20.1.2.2 route-map HAA in
 neighbor 20.1.2.2 route-map BOO out
!
 address-family ipv6
 network 2001:1:1:1::/64
 exit-address-family
!

After
!
router bgp 10
 bgp router-id 10.1.1.1
 bgp log-neighbor-changes
 no bgp default ipv4-unicast
 no bgp network import-check
 neighbor 10.1.1.2 remote-as 10
 neighbor 10.1.1.2 shutdown
 neighbor 10.1.1.2 update-source lo
 neighbor 10.1.1.2 advertisement-interval 1
 neighbor 10.1.1.2 timers connect 10
 neighbor 20.1.2.2 remote-as 20
 neighbor 20.1.2.2 shutdown
 neighbor 20.1.2.2 advertisement-interval 1
 neighbor 20.1.2.2 timers connect 10
!
 address-family ipv4 unicast
  network 9.9.9.9/32
  neighbor 10.1.1.2 activate
  neighbor 10.1.1.2 next-hop-self
  neighbor 10.1.1.2 route-map BAR in
  neighbor 10.1.1.2 route-map FOO out
  neighbor 20.1.2.2 activate
  neighbor 20.1.2.2 route-map HAA in
  neighbor 20.1.2.2 route-map BOO out
 exit-address-family
!
 address-family ipv6 unicast
  network 2001:1:1:1::/64
 exit-address-family
!