Add port to [graphite] log output

[jackzampolin]

Required for all non-trivial PRs

• Rebased/mergable
• Tests pass
• CHANGELOG.md updated
• Sign CLA (if not already signed)

If you have multiple [[graphite]] listeners it can be difficult to debug write errors because the port is not listed on the endpoint.

[mention-bot]

By analyzing the blame information on this pull request, we identified @e-dard to be a potential reviewer

[jackzampolin]

Current output:

• [graphite] {log_message}
• [graphite] 2016/05/03 03:44:37 unable to parse line: : received " " which doesn't have required fields

New output:

• [graphite] {port} {log_message}
• [graphite] :2001 2016/05/03 03:44:37 unable to parse line: : received " " which doesn't have required fields

@jsternberg

[jsternberg]

👍 Seems good to me.

[jackzampolin]

@balopat

[jsternberg]

@jackzampolin can you make another commit with an update to the changelog for this? I forgot to check for that when I was reviewing this.