Add tracing support for Apache HttpAsyncClient#84

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HaloFour wants to merge 9 commits intoComcast:masterfrom HaloFour:http-client-async

+825-27

Commits on Feb 13, 2018

Commits on Feb 26, 2018

Fix Scala compilation errors (wrong version) and consolidate implementation
HaloFour
committed
Add unit tests for TraceFriendlyHttpAsyncClient
HaloFour
committed
Propagate span onto request producer and response consumer threads
HaloFour
committed

Commits on Mar 1, 2018