Set Http Status Code in REST Predict

[lennon310]

Set http status code if the status field contains a non-200 code in /predict response. This avoids clients to handle the exception by creating the response by themselves in predict or predict_raw function. The code change should only affect REST code path.
Unit tests passed.

[seldondev]

Hi @lennon310. Thanks for your PR.

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[axsaucedo]

Thank you for your contribution @lennon310 - looks fantastic! I added a few comments. There seems to be some merge conflicts as well so may be required to rebase / merge master

[axsaucedo]

/ok-to-test

[lennon310]

Thanks @axsaucedo. Looks like the conflict was resolved.

[ukclivecox]

/approve

[seldondev]

[APPROVALNOTIFIER] This PR is APPROVED

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