Improved Centos 7 support in installer.

Till Brehm

2014-10-23 ccebb93050b9d2c32146882083fa50ae7c018f0d

 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