pygrub: fix the parameter `default' and `timeout' in elilo.conf

pygrub: fix the parameter `default' and `timeout' in elilo.conf

This patch fixes two issues related to the parameter `default' and
`timeout' in elilo.conf:

- LiloConf.py cannot interpret the parameter `default' and
  `timeout'. The first kernel always boot up even if the second kernel
  is specified by `default'. And `timeout' is ignored.

  This issue is introduced by cset 15953:70bb28b62ffb.

- If two kernels or more are installed, the last kernel cannot boot
  up even if it is specified by `default'.

Signed-off-by: KUWAMURA Shin'ya <kuwa@jp.fujitsu.com>