make lasers optional, off by default #1081

Job	Run time
docs (audit-serviceaccount)	25s
docs (authorize-private-service)	19s
docs (bucket-events)	17s
docs (cloudevent-broker)	20s
docs (cloudevent-trigger)	19s
docs (cloudevent-recorder)	18s
docs (regional-go-service)	27s
docs (regional-service)	22s
docs (serverless-gclb)	13s
docs (networking)	27s
docs (dashboard/service)	24s
docs (dashboard/job)	12s
docs (dashboard/cloudevent-receiver)	15s
docs (prober)	26s
docs (cron)	24s
docs (configmap)	27s
docs (secret)	27s
docs (github-bots)	19s
docs (github-wif-provider)	18s
docs (github-gsa)	27s
docs (github-events)	22s
docs (workqueue)	20s
conclusion	21s
	8m 9s

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