MFC r319844,r319845:

r319844:

Add positive and negative testcases for cam_get_device(3)

r319845:

Remove stdlib.h #include added in r319844

A previous iteration of the tests I added in r319844 involved free(3), but
that attempt didn't pan out, so I switched to stack allocated buffers instead
of heap allocated ones, making the #include unnecessary.

MFC with: r319844

MFC r316558:

Use __FBSDID instead of the license agreement to embed the $FreeBSD$ RCS keyword

Reminded by a comment made by markj w.r.t. using __FBSDID in .c files ala a
past Phabricator review.

MFC r315320:

Start adding basic tests for cam(3)

This change contains several negative and positive tests for:
- cam_open_device
- cam_close_device
- cam_getccb
- cam_freeccb

This also contains a test for the failure case noted in bug 217649,
i.e., O_RDWR must be specified because pass(4) requires it.

This test unfortunately cannot assume that cam-capable devices are
present, so the user must explicitly provide a device via
`test_suites.FreeBSD.cam_test_device`. In the future, a test kernel
module might be shipped, or ctl(4) might be used, as a test device
when testing out libcam, which will allow the tests to do away with
having to specify an explicit test device.

Start adding basic tests for cam(3)

This change contains several negative and positive tests for:
- cam_open_device
- cam_close_device
- cam_getccb
- cam_freeccb

This also contains a test for the failure case noted in bug 217649,
i.e., O_RDWR must be specified because pass(4) requires it.

This test unfortunately cannot assume that cam-capable devices are
present, so the user must explicitly provide a device via
`test_suites.FreeBSD.cam_test_device`. In the future, a test kernel
module might be shipped, or ctl(4) might be used, as a test device
when testing out libcam, which will allow the tests to do away with
having to specify an explicit test device.

Reviewed by: asomers, ken (earlier diff)
MFC after: 1 week
Sponsored by: Dell EMC Isilon
Differential Revision: D9928