Cherry-pick fix for greenpig#312

Merged

istio-testing merged 3 commits intoistio:release-1.8from

bianpengyuan:greenpig-18

Apr 16, 2021

Commits on Apr 15, 2021

http: Fixing empty metadata map handling (#230) #250

tonya11en
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bianpengyuan
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grpc: fix grpc-timeout integer overflow (#255)

Shikugawa
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bianpengyuan
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ssl: fix crash when peer sends an SSL Alert with an unknown code (#259)

authored and
bianpengyuan
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