Fixed service restart problems on CentOS 7.

Till Brehm

2014-09-24 6d6643de2b6fc47b15e27c46266f22866c1cd1a8

 server/lib/classes/system.inc.php

@@ -1722,7 +1722,7 @@
   function getinitcommand($servicename, $action, $init_script_directory = ''){
      global $conf;
      // systemd
      if(is_executable('/bin/systemd')){
      if(is_executable('/bin/systemd') || is_executable('/usr/bin/systemctl')){
         return 'systemctl '.$action.' '.$servicename.'.service';
      }
      // upstart