rollback changes in contrib #107

Job	Run time
opentelemetry-api	35s
opentelemetry-exporter-opencensus	36s
opentelemetry-exporter-otlp-combined	44s
opentelemetry-exporter-otlp-proto-common	38s
opentelemetry-exporter-otlp-proto-http	40s
opentelemetry-exporter-otlp-proto-grpc	42s
opentelemetry-getting-started	49s
opentelemetry-opencensus-shim	41s
opentelemetry-opentracing-shim	38s
opentelemetry-proto-protobuf5	27s
opentelemetry-sdk	43s
opentelemetry-semantic-conventions	35s
opentelemetry-exporter-prometheus	36s
opentelemetry-exporter-zipkin-combined	36s
opentelemetry-exporter-zipkin-json	38s
opentelemetry-exporter-zipkin-proto-http	38s
opentelemetry-propagator-b3	33s
opentelemetry-propagator-jaeger	35s
opentelemetry-test-utils	37s
	12m 1s

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