Support Cassandra Storage in v3 #16

Job	Run time
test_docker (receiver-zipkin-activemq)	1m 19s
test_docker (receiver-zipkin-activemq)	36m 39s
test	34m 46s
test	34m 46s
test_docker (receiver-zipkin-http)	1m 20s
test_docker (receiver-zipkin-http)	24m 46s
test_docker (receiver-zipkin-kafka)	1m 1s
test_docker (receiver-zipkin-kafka)	27m 28s
test_docker (receiver-zipkin-rabbitmq)	1m 22s
test_docker (receiver-zipkin-rabbitmq)	29m 9s
test_docker (receiver-zipkin-scribe)	1m 18s
test_docker (receiver-zipkin-scribe)	40m 48s
test_docker (storage-cassandra)	1m 21s
test_docker (storage-cassandra)	25m 4s
	4h 21m 7s

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