add review connection softupdate script

review_connect.sh is the release tool for review connection.
softupdate.conf is for Upstart respawn configuration file, it's not used at the product.

Signed-off-by: Lindell Xu <lxu@vetronicsltd.com.cn>
change review to reveal

Signed-off-by: Lindell Xu <lxu@vetronicsltd.com.cn>
add reveal local and subboard upgrade script

Signed-off-by: Lindell Xu <lxu@vetronicsltd.com.cn>
add return value

Signed-off-by: Lindell Xu <lxu@vetronicsltd.com.cn>
reveal upgrade release

Signed-off-by: Lindell Xu <lxu@vetronicsltd.com.cn>
add old version ux400-mod

Signed-off-by: Lindell Xu <lxu@vetronicsltd.com.cn>