__bird_ospf: add stubnets option

This commit adds the ability for the bird OSPF type to use stubnets.

type/__bird_ospf/man.rst

@@ -39,6 +39,12 @@ instance-id
     An OSPF instance ID, allowing several OSPF instances to run on the same
     links.
 
+OPTIONAL MULTIPLE PARAMETERS
+----------------------------
+
+stubnet
+    Add an optionless stubnet definition to the configuration.
+
 SEE ALSO
 --------
 cdist-type__bird_core(7)

type/__bird_ospf/manifest

@@ -58,6 +58,7 @@ $([ -n "${instance_id?}" ] && printf "\tinstance id %s;\n" "${instance_id?}")
 
 	area 0 {
 $(sed -e 's/^/\t\tinterface "/' -e 's/$/";/' "${__object:?}/parameter/interface")
+$(sed -e 's/^/\t\tsubnet /' -e 's/$/;/' "${__object:?}/parameter/subnet")
 	};
 }
 EOF

type/__bird_ospf/parameter/optional_multiple

@@ -0,0 +1 @@
+stubnet