REST-API: Add tests with Exasol DB V8

[kaklakariada]

Integration tests try to connect with encryption disabled. Exasol 8 does not allow unecrypted connections and tests fail with the following error message:

{"status":"error","exception":"E-ERA-2: error while opening a connection with Exasol: 
E-ERA-15: error while sending a login command via websockets connection: 
[08004] Connection exception - Only TLS connections are allowed."}