New mke2fs filesystem and usage types support

New mke2fs filesystem and usage types support

Provide mke2fs with a much more sophisticated system for controlling
configuration parameters of a newly created filesystem based on a
split filesystem and usage type system.  The -t option to mke2fs was a
deprecated alias to -c; it now specifies a filesystem type (ext2,
ext3, ext4, etc.), while the -T option can now be a comma separated
usage list.

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