replace ugly shell echo by logfile()

git-svn-id: http://www.observium.org/svn/observer/trunk@1736 61d68cd4-352d-0410-923a-c4978735b2b8

poller.php

@@ -326,7 +326,8 @@ if($polled_devices) {
 
 $string = $argv[0] . " $doing " .  date("F j, Y, G:i") . " - $polled_devices devices polled in $poller_time secs";
 if ($debug) echo("$string\n");
-shell_exec("echo '".$string."' >> ".$config['log_file']); # FIXME EWW
+
+logfile($string);
 
 unset($config); ### Remove this for testing