Added channel close listener and interruption of the pipelines in case Aquarium was the cause

[sparshev]

With this change on any channel close plugin will check if the cause is Aquarium (timeout or any other issue with application state) and will notify pipeline in this case. Otherwise it will just wait because the closed channel could mean that agent temporarily disconnected.

Also the change contains some cleanups and small fixes.

Related Issue

fixes: #18

Motivation and Context

Make it better

How Has This Been Tested?

Manually

Types of changes

• 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 change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.