Fixes #5842, use -x option when invoking ps in asynchronous process execution...

Fixes #5842, use -x option when invoking ps in asynchronous process execution code so processes that aren't attached to the terminal will be returned. Not using it causes climulti:request commands to fail when being executed by cron on some systems. The command will return early w/ no data.

core/CliMulti/Process.php

@@ -125,7 +125,7 @@ class Process
         }
 
         $lockedPID   = trim($content);
-        $runningPIDs = explode("\n", trim( `ps -e | awk '{print $1}'` ));
+        $runningPIDs = explode("\n", trim( `ps -ex | awk '{print $1}'` ));
 
         return !empty($lockedPID) && in_array($lockedPID, $runningPIDs);
     }