SLES11.xml: make serial port can be login

Move chroot-scripts into one section and make serial port setting
part with chrooted as false.

change from V1:
  revert the other lines, just change chroot part.

Signed-off-by: Xiangmin Han <xhan@redhat.com>
Merge pull request #1338 from Xiangmin/fix_SLES11_xml

SLES11.xml: make serial port can be login