Commit I8982523dbb94a7c5b8a4db88a196fabc4dd2873f added the need for
agent_config values for the routerInfo structure creation.
The NSX FWaaS does not use the agent at all, so this patch only adds
a dummy implementation to allow to code to continue working
Change-Id: Ib6dde4f7880fa45d01142792da17b68e719cada8