Fix disabled integration tests on branch 3.x when running against Scylla

[avelanarius]

Some integration tests were disabled in #94, as they did not pass against Scylla. Some of them were disabled due to testing Cassandra-specific functionality (unavailable in Scylla), but some of them look like real potential issues.

Fix those tests and re-enable them. Some tags in comments to look for:

• @IntegrationTestDisabledScyllaFailure - general regression when running with Scylla
• @IntegrationTestDisabledScyllaJVMArgs - disabling test, when running with Scylla, that uses Cassandra's JVM arguments
• @IntegrationTestDisabledScyllaQueryTrace - disabling test, when running with Scylla, that uses Cassandra's query tracing (hardcoded messages)
• @IntegrationTestDisabledScyllaUDF - disabling test, when running with Scylla, that uses Cassandra's UDF implementation
• @IntegrationTestDisabledScyllaUnsupportedFunctionality - disabling test, when running with Scylla, that uses functionality unsupported by Scylla (for example SASI indexes or Cassandra's CDC)
• @IntegrationTestDisabledScyllaUnsupportedIndex - disabling test, when running with Scylla, that uses Cassandra's indexes unsupported by Scylla
• @IntegrationTestDisabledSSL - a disabled test that also happens to test SSL functionality

Note that fixing some tests (such as https://github.com/scylladb/java-driver/blob/scylla-3.x/driver-core/src/test/java/com/datastax/driver/core/TableMetadataCDCTest.java) will require writing a new Scylla-specific test (in this example a test of parsing Scylla's CDC metadata).