Add support for EXT2_FEATURE_COMPAT_LAZY_BG

This feature is initially intended for testing purposes; it allows an
ext2/ext3 developer to create very large filesystems using sparse files
where most of the block groups are not initialized and so do not require
much disk space.  Eventually it could be used as a way of speeding up
mke2fs and e2fsck for large filesystem, but that would be best done by 
adding an RO_COMPAT extension to the filesystem to allow the inode table
to be lazily initialized on a per-block basis, instead of being entirely initialized
or entirely unused on a per-blockgroup basis.

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

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