net: use routes.running instead of routes.config in nns lookup (RedHatQE#2385)

Previously, the code accessed `routes.config` to retrieve route
information from the NodeNetworkState resource. However,
`routes.config` represents the desired configuration, not the
actual state of the node's network routes. To ensure that the
lookup reflects the real, currently active routes on the node,
the code now uses `routes.running`. This change improves accuracy
by querying the live state, which is essential for operations that
depend on the actual network setup.

Signed-off-by: Sergei Volkov <sevolkov@redhat.com>

Author: servolkov

tests/network/libs/nodenetworkstate.py

@@ -28,7 +28,7 @@ def lookup_br_ex_gateway_v4(node_name: str, client: DynamicClient) -> str:
     """
     nns_state = NodeNetworkState(name=node_name, client=client, ensure_exists=True).instance.status.currentState
 
-    for route in nns_state.routes.config:
+    for route in nns_state.routes.running:
         if route.destination == DEFAULT_ROUTE_V4.dst and route["next-hop-interface"] == DEFAULT_OVN_EXTERNAL_BRIDGE:
             return route["next-hop-address"]