Testing framework for install-cni template processing

[marqc]

Adds tests to verify cni_spec generation by install-cni.sh script

[aojea]

This is impressive, let´s get a run on CI

[aojea]

@jingyuanliang why are the githb actions not running?

[jingyuanliang]

Add those new shell scripts to the target of shellcheck?

[aojea]

Add those new shell scripts to the target of shellcheck?

those are tests, should we shelcheck the tests?

you are the experts here, it looks good to me but I´m very lazy with bash so you should review @jingyuanliang

[jingyuanliang]

those are tests, should we shelcheck the tests?

Hmm I just had some nitpicks and wanted shellcheck to say it for me.

[jingyuanliang]

Okay I just tried it. shellcheck gives many useless findings. Don't bother to add it then.

[marqc]

I decided to add it to shellcheck. Even if findings are not important or false-positive, having the check in pipeline can prevent us from introducing bugs later on.

I also want to add a readme file with documentation on the testing framework (how it works, how to use it). I will update the PR soon.

[marqc]

@jingyuanliang please take a look, it's ready for review now

[jingyuanliang]

I can think of several other test cases, but we can start with the current ones.

[jingyuanliang]

/lgtm
/approve

[google-oss-prow]

[APPROVALNOTIFIER] This PR is APPROVED

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