help: Enable the Opaque-LSA capability (rfc2370)
create:expression: "vyatta-vtysh -c \"configure terminal\" -c \"router ospf\" \
          -c \"ospf opaque-lsa \"; "
delete:expression: "vyatta-vtysh -c \"configure terminal\" -c \"router ospf\" \
          -c \"no ospf opaque-lsa \"; "