Allow clean K6 object when test has failed or finished OK

[aaguilartablada]

To solve the issue #275

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 2 committers have signed the CLA.

✅ aaguilartablada
❌ Álvaro Aguilar

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[JorTurFer]

LGTM

[yorugac]

Hi @aaguilartablada, apologies for such a terrible delay! Your PR never got a signed CLA: I remember thinking "let's wait until they sign before reviewing" and then apparently, I forgot about this PR since there were no new notifications 😅

Would you like to continue working on it? All contributors must sign the CLA though.