Upstream issue https://github.com/open-telemetry/opentelemetry-collector/issues/886.

It is also related to https://github.com/jaegertracing/jaeger/issues/2152. Our codebase will also require changes even though OTEL will provide a default config. The reason is that Jaeger already creates a default config. Jaeger could delegate the creation of the default config to OTEL and then add/modify it.