Comment 13 for bug 1905115

Thx yangjianfeng for Your comment but for me this use case sounds more like "some-new-agent" rather than new feature for metadata agent.
I'm not sure if we should extend metadata agent's functionalities in such way that it will do much more than providing metadata to the instances.
And such new agent can be done as separate project so it will not "collide" with Neutron :)