fix(tracing): add amqp prefetch #96

Job	Run time
Run Go Tests	4m 59s
Build images (httpimporter, sensorbucket/httpimporter, tools/Dockerfile.shared)	1m 54s
Build images (mqtt-ingress, sensorbucket/mqttingress, tools/Dockerfile.shared)	2m 2s
Build images (core, sensorbucket/core, tools/Dockerfile.shared)	2m 22s
Build images (tracing, sensorbucket/tracing, tools/Dockerfile.shared)	2m 13s
Build images (fission-user-workers, sensorbucket/fission-user-workers, tools/Dockerfile.shared)	3m 20s
Build images (fission-rmq-connector, sensorbucket/fission-rmq-connector, tools/Dockerfile.shared)	2m 29s
Build images (dashboard, sensorbucket/dashboard, services/dashboard/Dockerfile)	2m 16s
Build images (tenants, sensorbucket/tenants, services/tenants/Dockerfile)	2m 15s
	23m 50s

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