e2fsck: add logging capability

Add the ability to log messages about a file system to a specified
directory, using a file name templace that can be specified in
/etc/e2fsck.conf.  This allows us to suppress the output of overly
verbose e2fsck outputs while still allowing the full logging output to
go to an appropriate file.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
10 files changed