Collect test metadata in integration tests

[nfnt]

What type of PR is this?
/kind enhancement

What this PR does / why we need it:
The 'go-junit-report' project is used to convert go test output to a JUnit XML report. CircleCI is instructed to store these test results.

Which issue(s) this PR fixes:

Fixes #703

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[kudo-ci]

Welcome @nfnt! It looks like this is your first PR to kudobuilder/kudo 🎉

[kudo-ci]

Hi @nfnt. Thanks for your PR.

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[zen-dog]

Nice! 🚢

[nfnt]

I'm testing failed test reporting in #778.

[nfnt]

Small issue with error reporting of failed tests: Even though some tests failed, the overall result was reported as successful. Will have to fix this. This is how failed tests look in CircleCI.

[alenkacz]

L-O-V-E this ❤️

[kudo-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alenkacz, nfnt, zen-dog

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[nfnt]

Please hold with merging until I fixed the wrong reporting of failed tests.

[nfnt]

It's working now with 7fce66b. Take a look at #778 to see how failed test cases are reported.