* Add internaltest templates
* Generate internaltest using gotmpl
* Generate the sdk/internal/internaltest pkg
* Use sdk/internal/internaltest in sdk module
* Generate exporters/jaeger/internal/internaltest pkg
* Use exporters/jaeger/internal/internaltest in jaeger exporter
* Generate the exporters/zipkin/internal/internaltest pkg
* Use local internaltest in zipkin exporter
* Fix import path name in trace test