fix ibmMq auth with users without a password set

[faustin0]

This PR fix the authentication with users without a password (like the default user app in the ibm docker image).
Currently if we try to use the default(non admin) user in the test we get the following error:

JMSCMQ0001: WebSphere MQ call failed with compcode '2' ('MQCC_FAILED') reason '2035' ('MQRC_NOT_AUTHORIZED')
at com.ibm.msg.client.wmq.common.internal.Reason.createException(Reason.java:203)
at com.ibm.msg.client.wmq.internal.WMQConnection.<init>(WMQConnection.java:453)
at com.ibm.msg.client.wmq.factories.WMQConnectionFactory.createV7ProviderConnection(WMQConnectionFactory.java:8476)
at com.ibm.msg.client.wmq.factories.WMQConnectionFactory.createProviderConnection(WMQConnectionFactory.java:7815)
at com.ibm.msg.client.jms.admin.JmsConnectionFactoryImpl._createConnection(JmsConnectionFactoryImpl.java:322)
at com.ibm.msg.client.jms.admin.JmsConnectionFactoryImpl.createContext(JmsConnectionFactoryImpl.java:609)
...

The ibm client is expecting a null for a user without a password, otherwise a property is set that trigger the check:
see the line on the class:
com.ibm.mq.allclient- 9.2.2.0.jar/com/ibm/msg/client/jms/admin/JmsConnectionFactoryImpl.class:199.

In order to use the default user without admin permissions, we have to create the topics and queues used in the tests using a definitions.mqsc file that has been added to the script folder.