Use cassandra3 for biocache-backend
Use cassandra3 for biocache-backend

biocache-cli requires cassandra3 in its current configuration, upgrading biocache-backend to match that requirement.
AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install,AtlasOfLivingAustralia/ala-install