Add subscription id to tcp connections exceeded error message

[APErebus]

Background

When enabled and monitoring in PreProd Cloud, this error doesn't tell you which subscription has exceeded the limit, which is a bit annoying.

Results

Add the subscription id/uri to the exception & error log message

Example:

A polling client at [::1]:59764 has exceeded the maximum number of active connections (3) for subscription poll://sq-tentapoll/. New connections will be rejected

How to review this PR

Quality :heavy_check_mark:

Pre-requisites

• [ ] I have read How we use GitHub Issues for help deciding when and where it's appropriate to make an issue.
• [s] I have considered informing or consulting the right people, according to the ownership map.
• [s] I have considered appropriate testing for my change.