Re-implement NAC as a class based module (#9573)

* Less sql queries for nac module

* Re-implement NAC as a class based module

* Update comments

* update module capture order

* Fix style issues

LibreNMS/Util/ModuleModelObserver.php

@@ -0,0 +1,54 @@
+<?php
+/**
+ * DiscoveryModelObserver.php
+ *
+ * Displays +,-,U,. while running discovery and adding,deleting,updating, and doing nothing.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * @package    LibreNMS
+ * @link       http://librenms.org
+ * @copyright  2018 Tony Murray
+ * @author     Tony Murray <murraytony@gmail.com>
+ */
+
+namespace LibreNMS\Util;
+
+use Illuminate\Database\Eloquent\Model as Eloquent;
+
+class ModuleModelObserver
+{
+    public function saving(Eloquent $model)
+    {
+        if (!$model->isDirty()) {
+            echo '.';
+        }
+    }
+
+    public function updated(Eloquent $model)
+    {
+        d_echo("Updated data:", 'U');
+        d_echo($model->getDirty());
+    }
+
+    public function created(Eloquent $model)
+    {
+        echo '+';
+    }
+
+    public function deleted(Eloquent $model)
+    {
+        echo '-';
+    }
+}