chore(tracing): update default env value #105

Job	Run time
Run Go Tests	1m 34s
Build images (httpimporter, sensorbucket/httpimporter, tools/Dockerfile.shared)	1m 10s
Build images (mqtt-ingress, sensorbucket/mqttingress, tools/Dockerfile.shared)	1m 27s
Build images (core, sensorbucket/core, tools/Dockerfile.shared)	1m 38s
Build images (tracing, sensorbucket/tracing, tools/Dockerfile.shared)	1m 33s
Build images (fission-user-workers, sensorbucket/fission-user-workers, tools/Dockerfile.shared)	4m 27s
Build images (fission-rmq-connector, sensorbucket/fission-rmq-connector, tools/Dockerfile.shared)	1m 9s
Build images (dashboard, sensorbucket/dashboard, services/dashboard/Dockerfile)	1m 10s
Build images (tenants, sensorbucket/tenants, services/tenants/Dockerfile)	1m 41s
	15m 49s

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