ironic-discoverd: fix ironic config file path

TrivialFix

Change-Id: Idb15f134137a377690d69d9848791a95df572948

ansible/roles/ironic/templates/ironic-discoverd.json.j2

 {
-    "command": "ironic-discoverd --config-file /etc/ironic-discoverd/discoverd.conf",
+    "command": "ironic-discoverd --config-file /etc/ironic/ironic.conf",
     "config_files": [
         {
-            "source": "{{ container_config_directory }}/discoverd.conf",
-            "dest": "/etc/ironic-discoverd/discoverd.conf",
+            "source": "{{ container_config_directory }}/ironic.conf",
+            "dest": "/etc/ironic/ironic.conf",
             "owner": "root",
             "perm": "0600"
         }