Add testing steps for configuration list

[gligorisaev]

Add testing steps to check the configuration of:

• c8y.proxy.bind.address
• c8y.proxy.bind.port
• c8y.proxy.client.host
• c8y.proxy.client.port
• c8y.bridge.include.local_cleansession
• mqtt.topic_root
• mqtt.device_topic_id
• mqtt.client.host
• mqtt.client.port
• http.bind.address
• http.client.port
• http.client.host
• software.plugin.max_packages
• run.lock_files

-->

Types of changes

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Improvement (general improvements like code refactoring that doesn't explicitly fix a bug or add any new functionality)
• Documentation Update (if none of the other choices apply)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Paste Link to the issue

Checklist

• I have read the CONTRIBUTING doc
• I have signed the CLA (in all commits with git commit -s)
• I ran cargo fmt as mentioned in CODING_GUIDELINES
• I used cargo clippy as mentioned in CODING_GUIDELINES
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

Further comments

[github-actions]

Robot Results

✅ Passed	❌ Failed	⏭️ Skipped	Total	Pass %	⏱️ Duration
376	0	3	376	100	55m30.140999999s

[didier-wenzek]

Approved