cleanup various mmp cruft & bugs

Status from this message: Applied, thanks.

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#	Subject and files	Size	Replies
1/4	e2fsprogs: Document mmp commands in debugfs manpage`debugfs/debugfs.8.in`	+13 -0	1 reply
2/4	e2fsprogs: Tidy up mmp handling in debugfs`debugfs/debugfs.c` `debugfs/set_fields.c`	+15 -1	1 reply
3/4	e2fsprogs: Fix write size in ext2fs_mmp_write`lib/ext2fs/mmp.c`	+1 -1	1 reply
4/4	e2fsprogs: fix mmp tests on hard 4k devices (resend)`tests/f_mmp/script` `tests/f_mmp_garbage/expect.1` `tests/f_mmp_garbage/expect.2` +5 more	+46 ~~-46~~	1 reply

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Cover letter [PATCH 0/4] cleanup various mmp cruft & bugs

Found several issues while working out mmp issues on s390, this patch series addresses them.