Bug fix for integrity check using hmac key in serve #173

Job	Run time
collab-check	5s
wait-for-approval	2s
detect-changes	9s
integ-tests (sagemaker-mlops)	21m 25s
integ-tests (sagemaker-core)	12m 17s
codestyle-doc-tests (sagemaker-serve)	6m 29s
unit-tests (sagemaker-train)	28m 5s
unit-tests (sagemaker-core)	42m 24s
unit-tests (sagemaker-serve)	42m 11s
unit-tests (sagemaker-mlops)	27m 24s
codestyle-doc-tests (sagemaker-train)	6m 14s
codestyle-doc-tests (sagemaker-core)	29m 31s
integ-tests (sagemaker-serve)	30m 54s
integ-tests (sagemaker-train)	42m 1s
codestyle-doc-tests (sagemaker-mlops)	5m 11s
	4h 54m 22s

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