Don't use Hashtable

[willardgibbs]

In code we use Hashtable, because MQQueueManager constructor have it in signature.
But in [a64f23d] I made the following feature:

public void establish(String qmNqme, Map<String, Object> connectionProperties) throws MQException {
        queueManager = new MQQueueManager(qmNqme, new Hashtable<>(connectionProperties));
}

Now we can replaсe all Hashtable with HashMap except this method (SonarLint treats it well).