Default logging should write to stdout, not stderr

[batsatt]

java.util.logging.ConsoleHandler directs output to stderr, but server output would be better sent to stdout.

By fixing this with a new handler, we can also reduce the logging.properties boilerplate...

1. Add a handler that writes to System.out and installs the WebServerLogFormatter formatter:

package io.helidon.common;

import java.util.logging.Level;
import java.util.logging.LogRecord;
import java.util.logging.StreamHandler;

public class HelidonConsoleHandler extends StreamHandler {

    public ConsoleHandler() {
        setOutputStream(System.out);
        setLevel(Level.ALL); // Handlers should not filter, loggers should
        setFormatter(new WebServerLogFormatter());
    }

    @Override
    public void publish(LogRecord record) {
        super.publish(record);
        flush();
    }

    @Override
    public void close() {
        flush();
    }
}

2. Change all example logging.properties to use this handler and remove the explicit formatter, reducing the boilerplate (sans comments) to:

.level=INFO
handlers=io.helidon.common.HelidonConsoleHandler
java.util.logging.SimpleFormatter.format=%1$tY.%1$tm.%1$td %1$tH:%1$tM:%1$tS %4$s %3$s !thread!: %5$s%6$s%n