Avoid warnings about unspecified load balancing policy when connecting to a cloud cluster

Description

Reported by a user:

WARNING:cassandra.cluster:Cluster._init_ called with contact_points specified, but no load_balancing_policy. In the next major version, this will raise an error; please specify a load-balancing policy. (contact_points = [<SniEndPoint: e4daf7ab-8bb7-41aa-b8ec-3f820ebcc699-us-west-2.db.apollo.datastax.com:30002:20f0885b-8049-4c65-b4a0-6663666ba060>, <SniEndPoint: e4daf7ab-8bb7-41aa-b8ec-3f820ebcc699-us-west-2.db.apollo.datastax.com:30002:592a5a3b-bc1c-447d-849d-1c522e7e5a47>, <SniEndPoint: e4daf7ab-8bb7-41aa-b8ec-3f820ebcc699-us-west-2.db.apollo.datastax.com:30002:dc81a2bc-6fd9-4195-a773-978b55c45a5b>], lbp = None)

Environment

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Assignee

Unassigned

Reporter

Alan Boudreault

Fix versions

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