Fix Enable exporter shutdown ... #14

Job	Run time
opentelemetry-api	47s
opentelemetry-exporter-opencensus	41s
opentelemetry-exporter-otlp-combined	47s
opentelemetry-exporter-otlp-proto-common	56s
opentelemetry-exporter-otlp-proto-grpc	51s
opentelemetry-exporter-otlp-proto-http	50s
opentelemetry-exporter-prometheus	40s
opentelemetry-exporter-zipkin-combined	46s
opentelemetry-exporter-zipkin-json	45s
opentelemetry-getting-started	1m 11s
opentelemetry-opencensus-shim	42s
opentelemetry-exporter-zipkin-proto-http	49s
opentelemetry-opentracing-shim	44s
opentelemetry-propagator-jaeger	43s
opentelemetry-propagator-b3	36s
opentelemetry-proto	34s
opentelemetry-sdk	51s
opentelemetry-semantic-conventions	37s
opentelemetry-test-utils	35s
	14m 25s

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