Merge pull request #2393 from ClickHouse/v2_impl_server_for_tests

[repo] Integration tests improvements

Author: chernser

clickhouse-client/src/main/java/com/clickhouse/client/ClickHouseProtocol.java

@@ -7,7 +7,6 @@
 /**
  * This defines protocols can be used to connect to ClickHouse.
  */
-@Deprecated
 public enum ClickHouseProtocol {
     /**
      * Protocol detection is needed when establishing connection.