MFC r321949,r321950,r322101:

r321949:

Add expected failures for ZFS

- :f_flag fails on ZFS because UF_IMMUTABLE isn't supported [1].
- :v_flag fails on ZFS because the mode for foo is [always] updated
unnecessarily.

get_filesystem(..) (supporting function that was added to the test script)
is based on equivalent logic in usr.bin/extattr/tests/extattr_test.sh .

PR: 221189 [1], 221188 [2]

r321950:

Always use first parameter passed to get_filesystem(..) instead of discarding it
and using `.` instead.

MFC with: r321949
PR: 221189 [1], 221188 [2]

r322101:

Don't check result of chflags in f_flag_cleanup()

This will prevent false positives from occurring if the test is run on
ZFS since ZFS doesn't support fflags throbbing like UFS.

PR: 221189
MFC with: r321949

MFC r303212,r319642,r319830:

r303212 (by bdrewery):

Move chown tests to proper path

r319642:

Add some basic tests for chmod(1)

r319830:

Add more simple positive tests for chown(1)

The tests are largely symmetric with the tests for chmod(1)--added in r319642.

Remove chown-f_test (added in r268030) since the test coverage is now being
provided by `chown_test`.

Add some basic tests for chmod(1)

MFC after: 1 month
Sponsored by: Dell EMC Isilon