test generation for xml mediatype converting body to json to check schema

[SrHuevo]

I need to validate the body response when the response produces a XML mime type.

To do this, I transform the xml body response to json with xml2js module and I validate against the json scheme generated for swagger definition. In the same way that it was done when it was a json mime type.

I have added tests for check this feature (test/xmlConsumeTypeTest)

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[SrHuevo]

I signed it!

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We found a Contributor License Agreement for you (the sender of this pull request), but were unable to find agreements for the commit author(s). If you authored these, maybe you used a different email address in the git commits than was used to sign the CLA (login here to double check)? If these were authored by someone else, then they will need to sign a CLA as well, and confirm that they're okay with these being contributed to Google.
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[SrHuevo]

I just changed the email of the user commiter

[googlebot]

CLAs look good, thanks!

[baynezy]

This description is a copy and paste of another function

[baynezy]

This description is a copy and paste of another function

[SrHuevo]

sorry, I just changed it and amended

[SrHuevo]

I just added the possibility of setting a config for the module xml2js through the config param of the gentest function

[noahdietz]

Hey @SrHuevo I'm sorry but I've merged a couple of other changes and now there are some merge conflicts. Furthermore, some of the CI checks failed. The checks are just running npm test, so this is something you can resolve yourself.

If you are willing to resolve the conflicts and fix the tests, I'd still appreciate your contribution. Thank you.