On failure tests-runner should do non-zero exit

Right now test runner will always exit(0).
It's helpful to have zfs-tests.sh provide different
exit values depending on if everything passed or not.
We can then use common shell cmds to run tests until failure.

Reviewed-by: Brian Behlendorf <[email protected]>
Reviewed-by: George Melikov <[email protected]>
Reviewed-by: Giuseppe Di Natale <[email protected]>
Signed-off-by: Alek Pinchuk <[email protected]>
Closes #6285 

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