DYNDNS: force nsupdate as unconditional_online_cb

This is to trigger an update for every (eligible) netlink event.

This hardly a real solution, more like a test.

src/providers/be_ptask.c

@@ -357,12 +357,16 @@ errno_t be_ptask_create(TALLOC_CTX *mem_ctx,
 
     if (flags & BE_PTASK_OFFLINE_DISABLE) {
         /* install offline and online callbacks */
-        ret = be_add_online_cb(task, be_ctx, be_ptask_online_cb, task, NULL);
-        if (ret != EOK) {
-            DEBUG(SSSDBG_OP_FAILURE,
-                  "Unable to install online callback [%d]: %s\n",
-                  ret, sss_strerror(ret));
-            goto done;
+        if (strcmp(name, "Dyndns update") == 0) {
+            be_add_unconditional_online_cb(task, be_ctx, be_ptask_online_cb, task, NULL);
+        } else {
+            ret = be_add_online_cb(task, be_ctx, be_ptask_online_cb, task, NULL);
+            if (ret != EOK) {
+                DEBUG(SSSDBG_OP_FAILURE,
+                      "Unable to install online callback [%d]: %s\n",
+                      ret, sss_strerror(ret));
+                goto done;
+            }
         }
 
         ret = be_add_offline_cb(task, be_ctx, be_ptask_offline_cb, task, NULL);