sdk: Implement basic host resource detector #356

Job	Run time
opentelemetry-api	40s
opentelemetry-exporter-opencensus	52s
opentelemetry-exporter-otlp-proto-common	47s
opentelemetry-exporter-otlp-combined	49s
opentelemetry-exporter-otlp-proto-grpc	50s
opentelemetry-exporter-otlp-proto-http	53s
opentelemetry-getting-started	59s
opentelemetry-opencensus-shim	41s
opentelemetry-opentracing-shim	41s
opentelemetry-proto	28s
opentelemetry-sdk	59s
opentelemetry-semantic-conventions	32s
opentelemetry-exporter-prometheus	45s
opentelemetry-exporter-zipkin-combined	43s
opentelemetry-exporter-zipkin-json	38s
opentelemetry-exporter-zipkin-proto-http	46s
opentelemetry-propagator-b3	37s
opentelemetry-propagator-jaeger	36s
opentelemetry-test-utils	37s
	13m 53s

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