monitoring: Rearrange code in the HostdowntimeQuery

refs #9956

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

@@ -17,9 +17,6 @@ class HostdowntimeQuery extends IdoQuery
      * {@inheritdoc}
      */
     protected $columnMap = array(
-        'instances' => array(
-            'instance_name' => 'i.instance_name'
-        ),
         'downtimes' => array(
             'downtime_author'           => 'sd.author_name COLLATE latin1_general_ci',
             'downtime_author_name'      => 'sd.author_name',
@@ -51,6 +48,9 @@ class HostdowntimeQuery extends IdoQuery
         'hoststatus' => array(
             'host_state'                => 'CASE WHEN hs.has_been_checked = 0 OR hs.has_been_checked IS NULL THEN 99 ELSE hs.current_state END'
         ),
+        'instances' => array(
+            'instance_name' => 'i.instance_name'
+        ),
         'servicegroups' => array(
             'servicegroup'              => 'sgo.name1 COLLATE latin1_general_ci',
             'servicegroup_name'         => 'sgo.name1',
@@ -123,6 +123,18 @@ class HostdowntimeQuery extends IdoQuery
         );
     }
 
+    /**
+     * Join instances
+     */
+    protected function joinInstances()
+    {
+        $this->select->join(
+            array('i' => $this->prefix . 'instances'),
+            'i.instance_id = sd.instance_id',
+            array()
+        );
+    }
+
     /**
      * Join service groups
      */
@@ -160,18 +172,6 @@ class HostdowntimeQuery extends IdoQuery
         );
     }
 
-    /**
-     * Join instances
-     */
-    protected function joinInstances()
-    {
-        $this->select->join(
-            array('i' => $this->prefix . 'instances'),
-            'i.instance_id = sd.instance_id',
-            array()
-        );
-    }
-
     /**
      * {@inheritdoc}
      */