workflows: support set custom status (#639) #1231

Job	Run time
setup	18s
validate-example (actor)	2m 15s
validate-example (configuration)	1m 29s
validate-example (crypto)	1m 21s
validate-example (dist-scheduler)	57s
validate-example (grpc-service)	3m 1s
validate-example (hello-world)	52s
validate-example (pubsub)	1m 52s
validate-example (streamsub)	58s
validate-example (service)	1m 53s
validate-example (socket)	53s
validate-example (workflow)	1m 30s
validate-example (workflow-parallel)	1m 2s
	18m 21s

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