adds conversion methods between spec and API

[krishchow]

This PR adds some utility methods to convert resources between the Spec and the API, these methods can, in turn, be consumed by the sidecar, or vendor drivers. There are also some minor changes to the API to make this process smoother.

[k8s-ci-robot]

Hi @krishchow. Thanks for your PR.

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[krishchow]

cc @wlan0

[wlan0]

travis.yml shouldn't be ignored. no?

[krishchow]

I'm not sure, it is ignored in the sidecar, so I added the same ignore here as well.

[wlan0]

/ok-to-test

[wlan0]

LGTM except that one comment about travis.yml

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: krishchow, wlan0

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[wlan0]

/lgtm