try fix zipkin tests and docker-tests-proto #338

Job	Run time
opentelemetry-api	42s
opentelemetry-exporter-opencensus	39s
opentelemetry-exporter-otlp-combined	48s
opentelemetry-exporter-otlp-proto-common	52s
opentelemetry-exporter-otlp-proto-grpc	57s
opentelemetry-exporter-otlp-proto-http	1m 3s
opentelemetry-exporter-prometheus	37s
opentelemetry-exporter-zipkin-combined	39s
opentelemetry-exporter-zipkin-json	35s
opentelemetry-exporter-zipkin-proto-http	39s
opentelemetry-getting-started	58s
opentelemetry-opencensus-shim	38s
opentelemetry-opentracing-shim	45s
opentelemetry-propagator-b3	34s
opentelemetry-propagator-jaeger	35s
opentelemetry-proto	23s
opentelemetry-sdk	51s
opentelemetry-semantic-conventions	33s
opentelemetry-test-utils	36s
	13m 24s

Provide feedback