generic/707: Test moving directory while being grown

generic/707: Test moving directory while being grown

Test how the filesystem can handle moving a directory to a different
directory (so that parent pointer gets updated) while it is grown. Ext4
and UDF had a bug where if the directory got converted to a different
type due to growth while rename is running, the filesystem got
corrupted.

Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>