Add options to specify propagators for httptrace and grpctrace#784

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MrAlias merged 3 commits intoopen-telemetry:masterfrom

Aneurysm9:OTG-499

Jun 1, 2020

Commits on Jun 1, 2020

Add option to specify propagators to use with httptrace Extract and Inject
Aneurysm9
committed
Add option to specify propagators to use with grpctrace Extract and Inject
Aneurysm9
committed
Add license header to httptrace_test.go
Aneurysm9
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