Routing between tenants networks

[xsuchy]

Quick note for those interested in new OpenStack instance:

Routing between two tenants is apparently not possible. Or to be precise 
I did not discovered how to do that (and even Larsks did not know). 
However ... we can mark same network as "shared". This means that those 
networks are visible for all tenants and tenants can assign IP from this 
network to their VMs. So you can route two VM of two different tenants, 
but they must be with the same network.

So I had two option hows to set up Copr network:
1) put copr-be in copr-net network, but copr-be will be owned by 
infrastructure tenant or
2) we can give copr-be two NICs. One with IP from infrastructure network 
(with floatingIP mapped to this IP) and second NIC with IP from copr 
network. This way copr-be will be able to route builders using private 
IP. And we keep others VM (e.g. signer) quite isolated.

The option 2 seems much better to me, therefore I'm going this way.
I already tested it and it really works.
So conclusion is that "copr-net" and "coprdev-net" will be visible to

all tenants. And while you technically can put machines in that network, 
you should not do that as those networks are reserved for production and 
staging instances of Copr builders.

Mirek
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