add a few opcache relevant php-ini directives to be used with php-fpm; add opcache.restrict_api to the default php-config for each domain with the customer's docroot as default value

Signed-off-by: Michael Kaufmann (d00p) <d00p@froxlor.org>

templates/Sparkle/admin/phpconfig/overview_edit.tpl

@@ -80,6 +80,10 @@ $header
 					<td><em>{ADMIN}</em></td>
 					<td>{$lng['admin']['phpconfig']['admin']}</td>
 				</tr>
+				<tr>
+					<td><em>{DOCUMENT_ROOT}</em></td>
+					<td>{$lng['admin']['phpconfig']['docroot']}</td>
+				</tr>
 			</tbody>
 			</table>