Add trace headers to http subscriptions (#671) #33

Job	Run time
setup	20s
validate-example (actor)	2m 9s
validate-example (configuration)	1m 33s
validate-example (conversation)	1m 26s
validate-example (crypto)	1m 21s
validate-example (dist-scheduler)	1m 5s
validate-example (grpc-service)	2m 6s
validate-example (hello-world)	58s
validate-example (pubsub)	2m 0s
validate-example (streamsub)	56s
validate-example (service)	1m 52s
validate-example (socket)	54s
validate-example (workflow)	1m 28s
validate-example (workflow-parallel)	57s
	19m 5s

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