* Remove dependency on OpenTracing constants
* Remove OpenTracing tracer resolver
* Remove dep on OpenTracing Tracer and GlobalTracer
* Remove dep on OpenTracing ScopeManager/Context
* Remove dep on OpenTracing References
* Remove dep on OpenTracing Format
* Remove dep on OpenTracing Scope
* Remove dep on OpenTracing Span
* Remove OpenTracing compatibility tests
* Remove dep on OpenTracing SpanContext
* Remove dep on OpenTracing propagation classes
* Remove dep on OpenTracing log field name constants
* Remove dependency on OpenTracing
* Some last OpenTracing related renaming
* Remove unused code
* Remove code that's not doing anything
* A bit more cleanup
Remove compiled Scala artifacts from the actual instrumentation. Scala
is not binary compatible across major versions, and having
AkkaHttpClientTransformFlow.scala be in the artifact causes problems
when using anything but Scala 2.11.
Having the AkkaHttpClientTransformFlow implementation be in pure java
utilizing the Akka-stream Java DSL ensures that this will work across
any given Scala major version.