Add FWaaS scenario test for SSH via FIP

Add test_ssh_via_fip_with_fwaas_rules to verify FWaaS controls SSH
access to a VM via floating IP from the external network.

The test flow:
- FWaaS is enabled (skipped in setUp if not)
- Baseline: check VM reachable before applying firewall
- Phase 1: attach firewall group with empty policy, verify SSH blocked
- Phase 2: add allow SSH rule to ingress egress policy, verify SSH works

The network has port_security_enabled=False

Add setup_credentials override to disable Tempest default network
creation and avoid duplicate networks/subnets.

Add _create_network_subnet prefix for resource naming
(fwaas-ssh-fip).

Assisted-By: Cursor-composer-1.5

Signed-off-by: Fiorella Yanac <fyanac@redhat.com>
Change-Id: Ibd43b8b9db6bb93720609f19ba229fd42508024b
1 file changed