GH-3132: Remove usage of super();

Fixes https://github.com/spring-projects/spring-integration/issues/3132

It turns out that Checkstyle EmptyBlock doesn't complain about
empty default ctor.
Plus a new check for `super();` call treats it as a violation

* Remove `super();` from all the no-arg ctors
* Code style clean up in the affected classes according
IDEA suggestions

* Fix new Sonar smells

src/reference/asciidoc/jdbc.adoc

@@ -463,10 +463,6 @@ The following example uses the default implementation of `setValues` to store co
 ----
 public class JsonPreparedStatementSetter extends ChannelMessageStorePreparedStatementSetter {
 
-    public JsonPreparedStatementSetter() {
-        super();
-    }
-
     @Override
     public void setValues(PreparedStatement preparedStatement, Message<?> requestMessage,
         Object groupId, String region, 	boolean priorityEnabled) throws SQLException {