Use username/password authentication to test IBM MQ in the integration tests

[florenzen]

Description

The commit ibm-messaging/mq-container@a8ff0a5 changed the handling of passwords for the developer configuration. Therefore, it is necessary to explicitly set them in the container environment and for the client properties.

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

It fixes the integration tests.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[theodore-evans]

LGTM