add uber-trace-id for request header#110

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aslongyouloveme wants to merge 2 commits intoopentracing-contrib:masterfrom

aslongyouloveme:master

Commits on Jul 5, 2019

add uber-trace-id for request header,so microservice can get this for inherit span
aslongyouloveme
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Commits on Jul 8, 2019

wrappleExchange method use foreach instead iterator
aslongyouloveme
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