Add tests that unmount a file system while it is busy. On a vnd
device "cp -r" and "rm -rf" are working in the background while
"umount -f" or "mount -ur" are executed. Then "fsck -f" is used
to verify that the file system is clean.
Currently this triggers a bug quite reliably. After the mount point
has been changed to read-only, the file system check shows that not
everything was flushed and synced properly.
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