return return atf_no_error() instead of 0 for consistency.

suggested by moritzbuhl in https://github.com/NetBSD/src/pull/11/

Don't play with "../.." in includes for h_macros.h; deal with it centrally.
Minor fixes.

make the timeouts a bit more generous for really slow systems

double the timeout for slow hosts (from 1 to 2 seconds)

Adjusts tests after import of atf-0.12:

- The use.fs property is gone.
- Mark the tests/fs/t_create:attrs test as broken when using the default
unprivileged-user:_atf setting. This probably deser

Adjusts tests after import of atf-0.12:

- The use.fs property is gone.
- Mark the tests/fs/t_create:attrs test as broken when using the default
unprivileged-user:_atf setting. This probably deserves a fix somehow
but I'm not sure at this point.

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Re-add PR number and expected failure condition (as a comment, because the
problem is resolved). Per pooka's request.

Replace custom xfail settings with the new expected failure support in
atf 0.10.

add test for PR kern/43503