Fix flaking test #1669

Job	Run time
opentelemetry-api	41s
opentelemetry-sdk	44s
opentelemetry-proto-protobuf5	29s
opentelemetry-exporter-zipkin-proto-http	34s
opentelemetry-opentracing-shim	42s
opentelemetry-exporter-zipkin-combined	33s
opentelemetry-exporter-zipkin-json	33s
opentelemetry-exporter-prometheus	38s
opentelemetry-exporter-otlp-proto-grpc	44s
opentelemetry-semantic-conventions	29s
opentelemetry-opencensus-shim	35s
opentelemetry-exporter-opencensus	38s
opentelemetry-getting-started	59s
opentelemetry-exporter-otlp-combined	45s
opentelemetry-propagator-b3	35s
opentelemetry-exporter-otlp-proto-http	47s
opentelemetry-exporter-otlp-proto-common	39s
opentelemetry-propagator-jaeger	36s
opentelemetry-test-utils	43s
	12m 24s

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