Make default driver logging quiet (#972)

This update objective is to align the default logging setting with other Neo4j drivers.

Users can change the level according to their needs.

Author: injectives

driver/src/main/java/org/neo4j/driver/Config.java

@@ -34,7 +34,7 @@
 import org.neo4j.driver.util.Immutable;
 
 import static java.lang.String.format;
-import static org.neo4j.driver.Logging.javaUtilLogging;
+import static org.neo4j.driver.internal.logging.DevNullLogging.DEV_NULL_LOGGING;
 
 /**
  * A configuration class to config driver properties.
@@ -269,7 +269,7 @@ public String userAgent()
      */
     public static class ConfigBuilder
     {
-        private Logging logging = javaUtilLogging( Level.INFO );
+        private Logging logging = DEV_NULL_LOGGING;
         private boolean logLeakedSessions;
         private int maxConnectionPoolSize = PoolSettings.DEFAULT_MAX_CONNECTION_POOL_SIZE;
         private long idleTimeBeforeConnectionTest = PoolSettings.DEFAULT_IDLE_TIME_BEFORE_CONNECTION_TEST;