xfsprogs-5.8-fixes_2020-08-25

xfsprogs: various small enhancements

This short series contains a couple of enhancements.  The first patch
fixes a bug in xfs_check that we introduced during the 5.8 resync.  The
second patch allows administrators to set the DAX inode flag on the
entire filesystem at format time.  There's also manpage updates and
xfs_db support for the dax inode flag!

In v2 we add some more documentation updates and tweaks suggested by the
maintainer.