* adding support for TLS 1.3 for TCP listeners
* removed test as CI uses go 1.12
* removed Cassandra support, added deprecation notice
* re-added TestTCPListener_tls13
* Start work on passing context to backends
* More work on passing context
* Unindent logical system
* Unindent token store
* Unindent passthrough
* Unindent cubbyhole
* Fix tests
* use requestContext in rollback and expiration managers
The cassandra backend now supports a configurable connect timeout. The timeout is configured using the connect_timeout parameter in the session configuration. Also align the timeout to 5 seconds which is the default for the Python and Java drivers.
Fixes#1538
Supports creation and deletion of users in Cassandra using flexible CQL queries.
TLS, including client authentication, is supported.
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