fsck.ubifs: Check and correct files' information

fsck.ubifs: Check and correct files' information

This is the 10/18 step of fsck. Check and handle inconsistent files, the
checking rule is same as rebuild mode which has been implemented in
check_and_correct_files, but the methods of handling are different:
 1. Correct the file information for safe mode, danger mode and normal
    mode with 'yes' answer, other modes will exit.

Signed-off-by: Xiang Yang <xiangyang3@huawei.com>
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>