ETOS must understand exit codes from the test command

[andmat900]

Applicable Issues

• ETOS must understand exit codes from the test command etos#234

Description of the Change

This change adds the possibility to specify custom verdicts in a test runner (file given as env var $VERDICT_RULE_FILE), which is essentially a mapping of test framework exit codes to ETOS verdicts.

Alternate Designs

Possible Drawbacks

Sign-off

Developer's Certificate of Origin 1.1

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(a) The contribution was created in whole or in part by me and I
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(b) The contribution is based upon previous work that, to the best
of my knowledge, is covered under an appropriate open source
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by me, under the same open source license (unless I am
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person who certified (a), (b) or (c) and I have not modified
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Signed-off-by: Andrei Matveyeu, [email protected]

[fredjn]

Typehints and docstring updates.

[fredjn]

LGTM, but Tobias will have the final say.