[release-2.0] CI: fix flaky floatingip-create-full E2E test#814
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Add allocationPools to the external subnet to prevent the router gateway port from grabbing the IP address requested by the FloatingIP. Without allocationPools, Neutron auto-allocates from the full subnet range and can non-deterministically assign 192.168.155.5 to the router gateway port, causing the FloatingIP creation to fail with a 409 Conflict. Fixes #812
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Backport: #813
Add allocationPools to the external subnet to prevent the router gateway port from grabbing the IP address requested by the FloatingIP.
Without allocationPools, Neutron auto-allocates from the full subnet range and can non-deterministically assign 192.168.155.5 to the router gateway port, causing the FloatingIP creation to fail with a 409 Conflict.
Fixes #812