* Hide the context keys in the BaseTracer.
Provide the appropriate methods to get access.
* key needs to be static
* put all the span suppression logic in the BaseTracer
* the formatter is our friend
* rename method and add tests
* tests that work!
* Hide the context keys in the BaseTracer.
Provide the appropriate methods to get access.
* key needs to be static
* fix formatting
* more formatting, sigh
* remove an errant semicolon