vtysh: fix ldpd vtysh

[qlyoung]

ldpd needs a special case to execute the correct exit command for walkup
when using vtysh

fix #25

Signed-off-by: Quentin Young qlyoung@cumulusnetworks.com

[NetDEF-CI]

Continous Integration Result: SUCCESSFUL

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Tested-by: NetDEF / OpenSourceRouting.org CI System

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[rwestphal]

Thanks Quentin!

I confirm it fixes #25.

A few notes though:
1 - We need the same fix for stable/3.0;

2 - I just realized we have a similar problem with the LDP interface node when trying to copy and paste the running configuration:

debian(config)# do sh run
Building configuration...

Current configuration:
!
[snip]
!
mpls ldp
 router-id 1.1.1.1
 neighbor 2.2.2.2 password opensourcerouting
 neighbor 3.3.3.3 password opensourcerouting
 neighbor 4.4.4.4 password opensourcerouting
 !
 address-family ipv4
  discovery transport-address 1.1.1.1
  !
  interface rt1-eth1
  !
  interface rt1-eth2
  !
 !
!
l2vpn CUST_A type vpls
 bridge rt1-br0
 member interface rt1-eth0
 !
 member pseudowire rt1-mpw0
  neighbor lsr-id 2.2.2.2
  pw-id 100
 !
 member pseudowire rt1-mpw1
  neighbor lsr-id 3.3.3.3
  pw-id 100
 !
 member pseudowire rt1-mpw2
  neighbor lsr-id 4.4.4.4
  pw-id 100
 !
!
line vty
!
end
debian(config)#
debian(config)# mpls ldp
debian(config-ldp)#  router-id 1.1.1.1
debian(config-ldp)#  neighbor 2.2.2.2 password opensourcerouting
debian(config-ldp)#  neighbor 3.3.3.3 password opensourcerouting
debian(config-ldp)#  neighbor 4.4.4.4 password opensourcerouting
debian(config-ldp)#  !
debian(config-ldp)#  address-family ipv4
debian(config-ldp-af)#   discovery transport-address 1.1.1.1
debian(config-ldp-af)#   !
debian(config-ldp-af)#   interface rt1-eth1
debian(config-ldp-af-if)#   !
debian(config-ldp-af-if)#   interface rt1-eth2
% [LDP] Unknown command:   interface rt1-eth2
debian(config)#   !
debian(config)#  !
debian(config)# !
debian(config)# l2vpn CUST_A type vpls
debian(config-l2vpn)#  bridge rt1-br0
debian(config-l2vpn)#  member interface rt1-eth0
debian(config-l2vpn)#  !
debian(config-l2vpn)#  member pseudowire rt1-mpw0
debian(config-l2vpn-pw)#   neighbor lsr-id 2.2.2.2
debian(config-l2vpn-pw)#   pw-id 100
debian(config-l2vpn-pw)#  !
debian(config-l2vpn-pw)#  member pseudowire rt1-mpw1
debian(config-l2vpn-pw)#   neighbor lsr-id 3.3.3.3
debian(config-l2vpn-pw)#   pw-id 100
debian(config-l2vpn-pw)#  !
debian(config-l2vpn-pw)#  member pseudowire rt1-mpw2
debian(config-l2vpn-pw)#   neighbor lsr-id 4.4.4.4
debian(config-l2vpn-pw)#   pw-id 100
debian(config-l2vpn-pw)#  !
debian(config-l2vpn-pw)# !
debian(config-l2vpn-pw)#

Can you take a look at this for me?

I think the fix should be similar, but this time for LDP_IPV4_IFACE_NODE and LDP_IPV6_IFACE_NODE.

[qlyoung]

see #565