make creation of Cluster and Session in CqlConnection be virtual so that they could be customized in child classes
make creation of Cluster and Session in CqlConnection be virtual so that they could be customized in child classes

jorgebay/csharp-driver,maxwellb/csharp-driver,aNutForAJarOfTuna/csharp-driver,trurl123/csharp-driver,maxwellb/csharp-driver,alprema/csharp-driver,oguimbal/csharp-driver,kishkaru/csharp-driver,datastax/csharp-driver,mintsoft/csharp-driver,datastax/csharp-driver,AtwooTM/csharp-driver,bridgewell/csharp-driver