Revision 322069

Add a regression test for PR 221234

etc/mtree/BSD.tests.dist
tests/sys/cddl/zfs/tests/cli_root/Makefile
tests/sys/cddl/zfs/tests/cli_root/zfs_diff/...
	Add an automated test that checks the typical output of "zfs diff".
	The is the first and only automated test for "zfs diff".  It
	currently fails for a file that gets moved to a new directory.

PR:		221234
Sponsored by:	Spectra Logic Corp