Remove Pool sub types and implementations

Author: vietj

vertx-db2-client/src/main/java/io/vertx/db2client/DB2Builder.java

@@ -86,8 +86,8 @@ public ClientBuilder<SqlClient> with(PoolOptions options) {
       }
 
       @Override
-      protected SqlClient create(Vertx vertx, Supplier<Future<SqlConnectOptions>> databases, PoolOptions poolOptions, NetClientOptions transportOptions) {
-        return driver.createPool(vertx, databases, poolOptions, transportOptions);
+      protected SqlClient create(Vertx vertx, Supplier<Future<SqlConnectOptions>> databases, PoolOptions poolOptions, NetClientOptions transportOptions, Handler<SqlConnection> connectHandler) {
+        return driver.createPool(vertx, databases, poolOptions, transportOptions, );
       }
     };
   }

vertx-db2-client/src/main/java/io/vertx/db2client/DB2Pool.java

@@ -16,6 +16,7 @@
 package io.vertx.db2client.spi;
 
 import io.vertx.core.Future;
+import io.vertx.core.Handler;
 import io.vertx.core.Vertx;
 import io.vertx.core.impl.CloseFuture;
 import io.vertx.core.impl.ContextInternal;
@@ -27,7 +28,9 @@
 import io.vertx.sqlclient.Pool;
 import io.vertx.sqlclient.PoolOptions;
 import io.vertx.sqlclient.SqlConnectOptions;
+import io.vertx.sqlclient.SqlConnection;
 import io.vertx.sqlclient.impl.Connection;
+import io.vertx.sqlclient.impl.CloseablePool;
 import io.vertx.sqlclient.impl.PoolImpl;
 import io.vertx.sqlclient.impl.SqlConnectionInternal;
 import io.vertx.sqlclient.spi.ConnectionFactory;
@@ -47,15 +50,15 @@ public DB2ConnectOptions downcast(SqlConnectOptions connectOptions) {
   }
 
   @Override
-  public Pool newPool(Vertx vertx, Supplier<Future<DB2ConnectOptions>> databases, PoolOptions poolOptions, NetClientOptions transportOptions, CloseFuture closeFuture) {
+  public Pool newPool(Vertx vertx, Supplier<Future<DB2ConnectOptions>> databases, PoolOptions poolOptions, NetClientOptions transportOptions, Handler<SqlConnection> connectHandler, CloseFuture closeFuture) {
     VertxInternal vx = (VertxInternal) vertx;
     PoolImpl pool;
     if (poolOptions.isShared()) {
       pool = vx.createSharedResource(SHARED_CLIENT_KEY, poolOptions.getName(), closeFuture, cf -> newPoolImpl(vx, databases, poolOptions, transportOptions, cf));
     } else {
       pool = newPoolImpl(vx, databases, poolOptions, transportOptions, closeFuture);
     }
-    return new DB2PoolImpl(vx, closeFuture, pool);
+    return new CloseablePool<>(vx, closeFuture, pool);
   }
 
   private PoolImpl newPoolImpl(VertxInternal vertx, Supplier<Future<DB2ConnectOptions>> databases, PoolOptions options, NetClientOptions transportOptions, CloseFuture closeFuture) {