Emit close event for closed connections

[fh-qube]

SonarQube analysis reported 2 issues:

• 1 blocker
• 1 minor

Watch the comments in this conversation to review them. Note: the following issues could not be reported as comments because they are located on lines that are not displayed in this pull request:

• Reformat the code to have only one statement per line.

[fh-automatron]

Pull Request Quality Guidelines

As we continue to focus on quality, here are a few things to keep in mind:

• The code changes conform to the contributing & code style guides for this component (if they exist)
• A component owner should review your change (we've tagged these above)
• Automated testing has been added or updated for this change (e.g. UART, Unit/Acceptance tests)
• If updating server component this PR should be deployed to a grid somewhere (via fhcap-cli) - please provide a link to this
• Ensure JIRA is up to date before & after merge (e.g. deployment notes, tester notes, release notes, fix version)
• Any SonarQube issues should be addressed where applicable (use your own judgement)

Please ping a component owner (see fh contrib) when your builds are complete, changes are deployed and you're ready for a review. Fhcap PR will be generated automatically. To deploy your changes to a cluster place comment in this PR with pattern [x][y] where x=deploy and y=clustername you wish to deploy. You can also deploy your change manually using fhcap-cli