Bug fix for integrity check using hmac key in serve #168

Job	Run time
collab-check	3s
wait-for-approval	3s
detect-changes	9s
unit-tests (sagemaker-serve)	44m 0s
codestyle-doc-tests (sagemaker-serve)	6m 43s
unit-tests (sagemaker-mlops)	29m 29s
integ-tests (sagemaker-serve)	29m 51s
codestyle-doc-tests (sagemaker-mlops)	5m 34s
integ-tests (sagemaker-mlops)	21m 13s
	2h 17m 5s

Provide feedback