Bug fix for integrity check using hmac key in serve #166

Job	Run time
collab-check	3s
wait-for-approval	2s
detect-changes	9s
codestyle-doc-tests (sagemaker-serve)	3m 49s
unit-tests (sagemaker-serve)	3m 42s
codestyle-doc-tests (sagemaker-mlops)	3m 11s
integ-tests (sagemaker-mlops)	3m 11s
unit-tests (sagemaker-mlops)	3m 38s
integ-tests (sagemaker-serve)	3m 10s
	20m 55s

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