Limit what we display in phpinfo

- general information
- configuration
- modules

This way we avoid displaying sensitive things (such as httpOnly cookies
from environment of variables).

Signed-off-by: Michal Čihař <michal@cihar.com>

phpinfo.php

@@ -18,5 +18,5 @@ $response->getHeader()->sendHttpHeaders();
  * Displays PHP information
  */
 if ($GLOBALS['cfg']['ShowPhpInfo']) {
-    phpinfo();
+    phpinfo(INFO_GENERAL | INFO_CONFIGURATION | INFO_MODULES);
 }