MFC r268030,r268793,r303212,r319642,r319830:

r268030 (by eadler):

chown: add a test

Add a test for the chown utility. This sets up chown(8) to be capable of being
tested. As such, only add one test for now as an example.

r268793 (by eadler):

chown: Fix chown test number

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.