Cassandra3 span store doesn't return proper limits

[llinder]

While testing the Cassandra3 storage component I noticed that query limit is not accurate. Specifying a limit of 10 for "zipkin-server" "all" returns 4 results. Increasing the limit to 100 for "zipkin-server" "all" returns 38 results. Specifying an actual span name returns the desired limit so the problem seems isolated to the "all" case.

/cc @michaelsembwever

[victorlin-houzz]

Any update on this? Still seeing the same issue