fix(sdk): Add http status code check for token requests. Fixes #4312

[annajung]

Signed-off-by: Anna Jung (VMware) antheaj@vmware.com

Description of your changes:
Add HTTP status code check for token request response and throw an HTTPError instead of KeyError when the returned status is not 2xx

fixes #4312

Checklist:

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[annajung]

/assign @Bobgy for review

[Bobgy]

/lgtm
/ok-to-test

@chensun do you want to review?

[chensun]

/lgtm
/approve

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chensun

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