Add ability to set deploy interface

Change-Id: If41cee96258a06982748bca134ec70c2cde6e51b
diff --git a/ironic_tempest_plugin/config.py b/ironic_tempest_plugin/config.py
index 96a7f74..f9fefc4 100644
--- a/ironic_tempest_plugin/config.py
+++ b/ironic_tempest_plugin/config.py
@@ -113,6 +113,9 @@
     cfg.ListOpt('enabled_hardware_types',
                 default=['ipmi'],
                 help="List of Ironic enabled hardware types."),
+    cfg.ListOpt('enabled_deploy_interfaces',
+                default=['iscsi', 'direct'],
+                help="List of Ironic enabled deploy interfaces."),
     cfg.IntOpt('adjusted_root_disk_size_gb',
                min=0,
                help="Ironic adjusted disk size to use in the standalone tests "