[jdbc-v2] Add property to set cluster name

[chernser]

Description

There are cases when statements like KILL should have ON CLUSTER <cluster_name> clause.
There is no JDBC driver property that can set it.

What need to be done:

1. Add configuration property defining cluster name. If cluster name not null - then it should be used.
2. Add test that verifies KILL statement (using Statement.cancel()) has needed clause)