feat: manage route-reflectors

- add route-reflector role and hieradata
- enable using dhcp in networkd
- add hieradata/node/* entries for route-reflectors

modules/frrouting/templates/frr.conf.erb

@@ -10,6 +10,9 @@ interface <%= iface %>
 <% if params['passive'] == true -%>
  ip ospf passive
 <% end -%>
+<% if @mpls_ldp_interfaces and @mpls_ldp_interfaces.include?(iface) -%>
+ mpls enable
+<% end -%>
 exit
 <% end -%>
 router ospf