feat: support per-request region and service override in signer#1444

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AllanZhengYP merged 2 commits intoaws:masterfrom

AllanZhengYP:signer-override

Aug 19, 2020

Commits on Aug 17, 2020

feat: support per-request region and service override in signer
AllanZhengYP
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Commits on Aug 19, 2020

feat(signature-v4): address review feedbacks
AllanZhengYP
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