EventgridQuery: Make filter column `servicegroup' case-insensitive

...and add a case-sensitive query column.

refs #8613

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

@@ -31,7 +31,8 @@ class EventgridQuery extends IdoQuery
         ),
 
         'servicegroups' => array(
-            'servicegroup' => 'sgo.name1'
+            'servicegroup'      => 'sgo.name1 COLLATE latin1_general_ci',
+            'servicegroup_name' => 'sgo.name1'
         ),
 
         'hostgroups' => array(

modules/monitoring/library/Monitoring/DataView/Eventgrid.php

@@ -47,6 +47,6 @@ class Eventgrid extends DataView
 
     public function getFilterColumns()
     {
-        return array('host', 'service', 'hostgroup');
+        return array('host', 'service', 'hostgroup', 'servicegroup');
     }
 }