mke2fs: sort "-d" option alphabetically

Move the mke2fs "-d" option to be alphabetical like other options.

Rename "root_dir" to "src_root_dir" to avoid confusion with the
actual root inode in the new filesystem.

Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
1 file changed