add debug arguemtn to peers

templates/bird2/peer.conf.j2

@@ -8,5 +8,8 @@ protocol bgp {{ peer.name }} from dnpeers {
 protocol bgp {{ peer.name }}_v6 from dnpeers {
   # if you use link-local ipv6 addresses for peering using the following
   neighbor {{ peer.v6 }}%{{ peer.if.name | default('dn42_' + peer.name) }} as {{ peer.as }};
+{% if peer.debug is defined %}
+  debug {{ peer.debug }};
+{% endif %}
 };
 {% endif %}