Cause: NetworkManager is not installed on some EL7 systems by default. Consequence: The interface_pci_id could not be found. Fix: Ensure NetworkManager is installed on EL7. Result: The interface_pci_id can be used on EL7. Also - `module.warn` is deprecated - use `warnings` instead if `module.warn` is not supported. Fix the interface pci test to ensure NetworkManager is running before the test. Signed-off-by: Rich Megginson < rmeggins@redhat.com > ## Summary by Sourcery Ensure interface_pci_id functionality works reliably on EL7 systems and surface deprecation warnings without relying on module.warn support. Bug Fixes: - Ensure NetworkManager is installed and running on EL7 so interface_pci_id lookups succeed. - Return interface_pci_id lookup warnings via the module result when module.warn is unavailable. - Gate nftables ruleset checks in the interface PCI test on nftables backend availability. Enhancements: - Pass accumulated warning messages through the firewall module’s exit_json payload for consumers to inspect. - Refine interface PCI ID parsing to return both interface names and an optional warning message. Tests: - Update the interface PCI integration test to install/start NetworkManager on EL7 and to use shared distro vars for backend detection. Chores: - Adjust package defaults to include NetworkManager and python-ipaddress on EL7 to support interface_pci_id and ipaddress usage.