Fix codecov.io's "No coverage uploaded for pull request base" with Jenkins about test-infra

[sebastienvas]

I am wondering if it ll make more sense to have a git repo with all the scripts that we share instead of having them in istio testing. then we can use a git submodule for those on each repo. That way we can share best practices more easily.

[ayj]

Sounds reasonable assuming the individual repos share common structure, development, practices, etc. But not sure how that would affect this particular issue? I thought the "no coverage" error was because we aren't generating coverage report on merged commits to master via post-submit hook?

[sebastienvas]

For this issue I ll just create a shared method to publish Code Coverage and will leave the /bin/codecov script.

[sebastienvas]

this was resolved with #85.