ocs-iso: Always return success after successful iso creation
The ocs-iso script returns exit code of the last command executed. This is either failure of [ -e "$target_iso" ], or failure from [ "$BOOTUP" = "color" ], or result of $SETCOLOR_NORMAL execution.
In the case if BOOTUP is different from "color" ocs-iso returns non-zero (a failure) even after successful generation of iso image, which can confuse a caller script.
Signed-off-by: Vitaly Kuzmichev vkuzmichev@dev.rtsoft.ru