Explain why test is skipped #199

Job	Run time
opentelemetry-api	41s
opentelemetry-semantic-conventions	32s
opentelemetry-sdk	46s
opentelemetry-exporter-otlp-proto-http	52s
opentelemetry-exporter-zipkin-combined	43s
opentelemetry-exporter-prometheus	36s
opentelemetry-proto-protobuf5	27s
opentelemetry-test-utils	39s
opentelemetry-opentracing-shim	43s
opentelemetry-exporter-zipkin-json	36s
opentelemetry-exporter-otlp-proto-common	38s
opentelemetry-exporter-otlp-combined	41s
opentelemetry-propagator-jaeger	37s
opentelemetry-exporter-otlp-proto-grpc	41s
opentelemetry-getting-started	51s
opentelemetry-exporter-opencensus	37s
opentelemetry-exporter-zipkin-proto-http	35s
opentelemetry-opencensus-shim	39s
opentelemetry-propagator-b3	32s
	12m 26s

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