add ServiceSingleSignOn test link

clientarea.tpl

@@ -6,6 +6,13 @@
           <td align='left'>Webmail</td>
           <td align="left"><a href="{$webmailurl}" target="_blank">{$webmailurl}</a></td>
         </tr>
+        <tr>
+          <td colspan=2>
+            <button type="button" class="btn btn-default">
+              <a href=/clientarea.php?action=productdetails&id={$serviceid}&dosinglesignon=1 target=_blank>Sigle Sign On</a>
+            </button>
+          </td>
+        </tr>
       </table>
     </td>
   </tr>