tests: ts_scsi_debug_init skip instead of die

If any of these modprobe commands fails then it's not a broken test.
ALso ts_die often does not work correctly from subtests which should
be fixed someday too.

BTW modprobe dry-run (even the real modprobe) is not reliable.
Moreover now we respect blacklisted modules (-b).

This error handling is not only useful to let the test-suite succeed
on broken systems but also to not fail all "scsi_debug tests" after
just one of them failed to umount something.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
tests: run tests in deterministic order

Not really needed but it makes debugging of existing build logs
much more easier.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
tests: fix, typo schedutils/cpuset

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
tests: split off losetup scsi_debug part

It's a pity that we would skip the whole test if scsi_debug is not
available.

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
Merge branch 'tests-stuff' of https://github.com/rudimeier/util-linux

* 'tests-stuff' of https://github.com/rudimeier/util-linux:
  tests: split off losetup scsi_debug part
  tests: fix, typo schedutils/cpuset
  tests: run tests in deterministic order
  tests: ts_scsi_debug_init skip instead of die