MFC r290265,r290267,r290270:

r290265:

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
Sponsored by: EMC / Isilon Storage Division

r290267:

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

Sponsored by: EMC / Isilon Storage Division

r290270:

Add testcases for -t ffs -o version=[12]

Verify the filesystem type using dumpfs. Add preliminary support
for NetBSD (needs to be validated)

Sponsored by: EMC / Isilon Storage Division