Comment 3 for bug 1216076

Thank you.

I do not know what is the reason behind the 'private' network does not created as shared at the first place.

The other option is adding new option for tempest for handling the environment without shared network and create a router+net+subnet for every 'randomly' created tenant.

It can be made more smarter by adding '_new_net_for' set for every test class with the , 'primary', 'admin', 'alt' , and just create networks for the explicitly mentioned tenants.