Fixes #1116 Only set readOnly/autoCommit during connection setup if they differ from defaults.

src/main/java/com/zaxxer/hikari/pool/PoolBase.java

@@ -406,8 +406,13 @@ abstract class PoolBase
             setNetworkTimeout(connection, validationTimeout);
          }
 
+         if (connection.isReadOnly() != isReadOnly) {
             connection.setReadOnly(isReadOnly);
+         }
+
+         if (connection.getAutoCommit() != isAutoCommit) {
             connection.setAutoCommit(isAutoCommit);
+         }
 
          checkDriverSupport(connection);