Treat the local provider as a special case

The local provider needs no backend, so we'll create a special
provider entry for it called "local" that will not attempt to
retrieve provider configuration but will remain in the service
list so it can be updated when the config file changes.

server/examples/sssd.conf

@@ -60,6 +60,7 @@ description = Domains served by SSSD
 
 ; [domains/LOCAL]
 ; description = LOCAL Users domain
+; provider = local
 ; enumerate = 3
 ; minId = 500
 ; maxId = 999

server/monitor/monitor.c

@@ -516,6 +516,11 @@ static int service_signal_reload(struct mt_svc *svc)
     DBusConnection *conn;
     DBusPendingCall *pending_reply;
 
+    if (svc->provider && strcasecmp(svc->provider, "local") == 0) {
+        /* The local provider requires no signaling */
+        return EOK;
+    }
+
     conn = sbus_get_connection(svc->mt_conn->conn_ctx);
     msg = dbus_message_new_method_call(NULL,
                                        SERVICE_PATH,
@@ -954,7 +959,7 @@ static int update_monitor_config(struct mt_ctx *ctx)
                 cur_svc = cur_svc->next;
             }
             if (cur_svc == NULL) {
-                DEBUG(0, ("Service entry missing data\n"));
+                DEBUG(0, ("Service entry missing data for [%s]\n", new_dom->name));
                 /* This shouldn't be possible
                  */
                 talloc_free(new_config);
@@ -1911,6 +1916,16 @@ static void service_startup_handler(struct tevent_context *ev,
         return;
     }
 
+    if (mt_svc->provider && strcasecmp(mt_svc->provider, "local") == 0) {
+        /* The LOCAL provider requires no back-end currently
+         * We'll add it to the service list, but we don't need
+         * to poll it.
+         */
+        DLIST_ADD(mt_svc->mt_ctx->svc_list, mt_svc);
+        talloc_set_destructor((TALLOC_CTX *)mt_svc, delist_service);
+        return;
+    }
+
     mt_svc->pid = fork();
     if (mt_svc->pid != 0) {
         if (mt_svc->pid == -1) {