fsck.c: Added support for LABEL= and UUID= specifications for the
filesystem's device, to match what recent mount programs can support.
Also, close stdin when doing fsck -A or when checking more than one
filesystem at a time, so that e2fsck doesn't try to ask interactive
questions if the filesystem appears to be mounted.
get_device_by_label.c: New file added to support LABEL=foo and
UUID=bar type specifications.
Theodore Ts'o