tests: replace deprecated '-s eq:...' with '-s exit:...'

Mark randomly failing test cases as expected failures with a reference
to PR bin/56506.

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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atf-0.9 introduces an use.fs test-case property to allow tests to write to
their work directory. The purpose is to be able to know which tests intend
to touch the file system and to allow a minor op

atf-0.9 introduces an use.fs test-case property to allow tests to write to
their work directory. The purpose is to be able to know which tests intend
to touch the file system and to allow a minor optimization in atf-run.

Define use.fs=true for all those tests requiring it. (This highlights that
some tests currently require modifying the file system but conceptually
they shouldn't be... which leaves room for further improvements/cleanups
later :-)

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Fix execution of the installed tests by using h_{simple,args} as program
names, without the .sh extension.

Add some basic tests for rc.d scripts to validate the execution of
subcommands and the optional argument passing to them from the command
line.

Triggered by the modification of the run_rc_command fu

Add some basic tests for rc.d scripts to validate the execution of
subcommands and the optional argument passing to them from the command
line.

Triggered by the modification of the run_rc_command function in rc.subr
to allow passing in extra parameters to the commands defined in rc.d
scripts.

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