obs: add library functions - 02

[nitishfy]

Reference: kubernetes/sig-release#2295

Add the library functions to interact with OBS.

[k8s-ci-robot]

Hi @nitishfy. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[nitishfy]

/test all

[k8s-ci-robot]

@nitishfy: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to this:

/test all

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[xmudrii]

/ok-to-test

[xmudrii]

Just a single nit that you can address in a follow up PR
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: nitishfy, xmudrii

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[xmudrii]

/lgtm