collector.py: don't assume eth0 == admin network
collector.py: don't assume eth0 == admin network

In some case, node IP may come from another networ, that's the case of
the install-server on enocloud.

Now, we do a lookup in the network list to find the correct information
to associate with the IP.

redhat-cip/infra-virt,enovance/infra-virt,redhat-cip/infra-virt,enovance/infra-virt