some fixes to generate.sh in semconv #53

Job	Run time
opentelemetry-api	44s
opentelemetry-getting-started	1m 0s
opentelemetry-opentracing-shim	38s
opentelemetry-proto	25s
opentelemetry-sdk	46s
opentelemetry-semantic-conventions	41s
opentelemetry-exporter-opencensus	39s
opentelemetry-exporter-otlp-combined	43s
opentelemetry-exporter-otlp-proto-common	43s
opentelemetry-exporter-otlp-proto-grpc	55s
opentelemetry-exporter-otlp-proto-http	45s
opentelemetry-exporter-prometheus	38s
opentelemetry-exporter-zipkin-combined	40s
opentelemetry-exporter-zipkin-json	39s
opentelemetry-exporter-zipkin-proto-http	45s
opentelemetry-opencensus-shim	38s
opentelemetry-propagator-b3	43s
opentelemetry-propagator-jaeger	38s
opentelemetry-test-utils	38s
	13m 18s

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