Comment 5 for bug 1766702

So basically problem here is that in neutron-dynamic-routing tempest tests, there is first created subnetpool and then subnet from this pool. And cidrs are always hardcoded there so it can't allocate same cidr for two tests.
Allowing to allocate cidr automatically is also not a solution here as cidr needs to be from specific subnetpool.
I will investigate how to fix that in neutron-dynamic-routing tests without changing too much logic there