Add Tenant reference to all main objects

[Alex-Ignatov]

I noticed that only Communities and Sessions have reference to the tenant.

From consistency and permission/ownerships point of view, it would be nice to have tenant reference filed for all other BGP objects like Community Lists, Routing Policies, Prefix Lists, AS Path lists and Peer groups. This would help to manage modifications and access to all of these based on tenant ownership via permissions. Custom fields could do this but it looks more like bandaid than a proper solution.