fix(dao) assume C* > 3.x will use the same system schema
fix(dao) assume C* > 3.x will use the same system schema

To ensure that Kong works with DataStax DSE 6.0 (which uses Cassandra
4.x), we can for now assume that the system schema will be identical as
that of Cassandra 3.x.

This does NOT mean Kong is compatible with Cassandra 4.x, and is only
meant as a temporary hotfix for users wishing to run/test Kong with
advanced versions of Cassandra.

Fix #3410

Signed-off-by: Thibault Charbonnier <3c2e9133e272cb489e2fea0c4328cf56b08e4226@me.com>

Kong/kong,Kong/kong,Mashape/kong,Kong/kong