monitoring: Remove HostgroupQuery::getGroup()

refs #9956

modules/monitoring/library/Monitoring/Backend/Ido/Query/HostgroupQuery.php

@@ -13,6 +13,16 @@ class HostgroupQuery extends IdoQuery
      */
     protected $allowCustomVars = true;
 
+    /**
+     * {@inheritdoc}
+     */
+    protected $groupBase = array('hostgroups' => array('hg.hostgroup_id', 'hgo.object_id'));
+
+    /**
+     * {@inheritdoc}
+     */
+    protected $groupOrigin = array('hostobjects');
+
     /**
      * {@inheritdoc}
      */
@@ -140,17 +150,4 @@ class HostgroupQuery extends IdoQuery
             array()
         );
     }
-
-    /**
-     * {@inheritdoc}
-     */
-    public function getGroup()
-    {
-        $group = array();
-        if ($this->hasJoinedVirtualTable('hostobjects')) {
-            $group = array('hg.hostgroup_id', 'hgo.object_id');
-        }
-
-        return $group;
-    }
 }