T2898: add ndp-proxy service

VyOS CLI command
  set service ndp-proxy interface eth0 prefix 2001:db8::/64 mode 'static'

Will generate the following NDP proxy configuration

  $ cat /run/ndppd/ndppd.conf
  # autogenerated by service_ndp-proxy.py

  # This tells 'ndppd' how often to reload the route file /proc/net/ipv6_route
  route-ttl 30000

  # This sets up a listener, that will listen for any Neighbor Solicitation
  # messages, and respond to them according to a set of rules
  proxy eth0 {
      # Turn on or off the router flag for Neighbor Advertisements
      router no
      # Control how long to wait for a Neighbor Advertisment message before invalidating the entry (milliseconds)
      timeout 500
      # Control how long a valid or invalid entry remains in the cache (milliseconds)
      ttl 30000

      # This is a rule that the target address is to match against. If no netmask
      # is provided, /128 is assumed. You may have several rule sections, and the
      # addresses may or may not overlap.
      rule 2001:db8::/64 {
          static
      }
  }

1 files changed, 6 insertions, 6 deletions

diff --git a/debian/control b/debian/control
index 08adc8a68..af42202fc 100644
--- a/debian/control
+++ b/debian/control
@@ -152,7 +152,7 @@ Depends:
   console-data,
   dropbear,
 # End "service console-server"
-# For "set service aws glb"
+# For "service aws glb"
   aws-gwlbtun,
 # For "service dns dynamic"
   ddclient (>= 3.11.1),
@@ -160,6 +160,9 @@ Depends:
 # # For "service ids"
   fastnetmon [amd64],
 # End "service ids"
+# # For "service ndp-proxy"
+  ndppd,
+# End "service ndp-proxy"
 # For "service router-advert"
   radvd,
 # End "service route-advert"
@@ -251,18 +254,15 @@ Depends:
 # For "nat64"
   jool,
 # End "nat64"
-# For nat66
-  ndppd,
-# End nat66
 # For "system ntp"
   chrony,
 # End "system ntp"
 # For "vpn openconnect"
   ocserv,
 # End "vpn openconnect"
-# For "set system flow-accounting"
+# For "system flow-accounting"
   pmacct (>= 1.6.0),
-# End "set system flow-accounting"
+# End "system flow-accounting"
 # For container
   podman,
   netavark,