makefs: clean up some leftovers after $FreeBSD$ tag removal

Fixes: 2a63c3be1582

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

makefs: Remove execute permission from in-tree test scripts

Let the build system set it as needed. No functional change intended.

MFC after: 1 week
Sponsored by: The FreeBSD Foundation

Check for cd9660 support before attempting to mount created images

This extends the set in r316028 to allow all tests to pass or be skipped
on a system without cd9660 support.

A better approach using tar is possible, but this works today.

Obtained from: CheriBSD
Sponsored by: DARPA, AFRL
Differential Revision: https://reviews.freebsd.org/D10516

Update several more URLs

- Primarily http -> https
- Primarily FreeBSD project URLs

Require strings(1) with :o_flag_preparer and :o_flag_publisher

strings(1) might not be installed on the system, e.g., if MK_TOOLCHAIN == no

MFC after: 1 week

Check to see if the kernel has cd9660 before running tests that require it

Approved by: ngie
MFC after: 1 week
Differential Revision: https://reviews.freebsd.org/D10096

Clean up mtree keyword support a slight bit and add a few more default keywords

- Parameterize the mtree keywords as $DEFAULT_MTREE_KEYWORDS
- Test with the extra mtree keywords, `mode,gid,uid`.
- Add a note about mtrees with time support not working with makefs right now

MFC after: 1 week
Sponsored by: EMC / Isilon Storage Division

Add testcases for -t cd9660 -o isolevel=[1-3]

-- -o isolevel=1 currently fails because of path comparison issues,
so mark it as an expected failure.
-- -o isolevel=3 is not implemented, so expect it to fail as an out
of bounds value [*].

PR: 203645
MFC after: 1 week
X-MFC with: r290264
Sponsored by: EMC / Isilon Storage Division

Add a regression test for r289899 to validate rockridge encoding
of device types

X-MFC with: r289899
MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

Add more cd9660/FFS makefs testcases

General changes:
- Parameterize out the mount command.
- Use mtree to verify the contents of an image (check_image_contents) instead
of using diff (diff verifies content, but not file metadata).
- Move common logic out to functions (common_cleanup, mount_image,
check_image_contents)
- Add stub testcases for makefs -D (crashes with SIGBUS, similar to bug # 192839)
- Add a note about the ISO-9660 and rockridge specs
- Add testcases that exercise:
-- Creating disk images from an mtree and multiple directories.
-- -F flag use (not really an extensive testcase right now)

cd9660-specific test changes:

- Remove an XXX comment about symlinks; I forgot that non-rockridge images turn
symlinks into hardlinks.
- Add testcases that exercise:
-- -o allow-deep-trees
-- -o allow-max-name stub testcase (doesn't seem to be implemented in makefs)
-- -o preparer (existence in image; not conformance to spec)
-- -o publisher (existence in image; not conformance to spec)
-- -o rockridge (basic)

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

Revise "create_test_inputs" to simplify the file structure as
these testcases don't need to be nested as much as bin/ls/ls_tests.sh
do when verifying ls -a, ls -A, etc. This allows the tests to make
all paths relative to the top of the temporary directory instead of
always tacking on $ATF_TMPDIR, thus complicating things unnecessarily

Create non-empty files in create_test_inputs as well now, similar to
create_test_inputs2 in bin/ls/ls_tests.sh

Compare the input files to the output file contents using diff where
possible:
- Skip over the fifo comparison for now because it always fails
- Skip over the symlink comparison on cd9660 because it always fails
today

Sponsored by: EMC / Isilon Storage Division
MFC after: 2 weeks
X-MFC with: r289739

Correctly reintroduce the rudimentary smoke tests I botched up
in r289684

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division

Revert r289694

I committed some other undesirable local changes by accident

Add some rudimentary [smoke] testcases for makefs

MFC after: 2 weeks
Sponsored by: EMC / Isilon Storage Division