add ftest coverage

Signed-off-by: Michael MacDonald <[email protected]>

Author: mjmac

src/tests/ftest/server/daos_server_config.yaml

@@ -171,3 +171,13 @@ server_config_val: !mux
       - "targets"
       - -1
       - "FAIL"
+  control_interface_invalid:
+    config_val:
+      - "control_interface"
+      - "nonexistent_interface_12345"
+      - "FAIL"
+  control_interface_lo:
+    config_val:
+      - "control_interface"
+      - "lo"
+      - "PASS"

src/tests/ftest/util/server_utils_params.py

@@ -1,6 +1,6 @@
 """
   (C) Copyright 2020-2024 Intel Corporation.
-  (C) Copyright 2025 Hewlett Packard Enterprise Development LP
+  (C) Copyright 2025-2026 Hewlett Packard Enterprise Development LP
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 """
@@ -141,6 +141,7 @@ def __init__(self, filename, common_yaml, version=None):
         self.control_log_file = LogParameter(log_dir, None, "daos_control.log")
         self.helper_log_file = LogParameter(log_dir, None, "daos_server_helper.log")
         self.telemetry_port = BasicParameter(None, 9191)
+        self.control_interface = BasicParameter(None)
         self.client_env_vars = BasicParameter(None)
 
         # access_points was changed to mgmt_svc_replicas in 2.7