* Remove otel/sdk dependency from grpctrace
Use otel/trace/testtrace instead and cleanup testing code.
* Update httptrace to not depend on the SDK
Update testing to use api/trace/testtrace instead.
* Add changes to Changelog
* Make the SDK its own Go module
* Upgrade go.mod to 1.14 project wide
* go mod tidy
* Make the stdout exporter its own package
Follow the pattern of the other exporters.
* Update dependabot with stdout exporter
* Add replace directives for stdout exporter
* Remove outdated example test from metric SDK
* go mod tidy
* Update othttp example test
Remove unused stdout exporter.
* Remove tests in API that depend on stdout exporter
The global package does not need to be validated with the SDK. A more
properly constructed end-to-end integration test should be built if this
is actually needed.
* Add replace clause for otel in stdout go.mod
