[2.1.3] Consistently handle connection aborts

[halter73]

We should backport backport of graceful server shutdown fixes which improve functional test reliability, and followup PRs that normalize the exceptions thrown by the libuv and socket transports while providing better logs and error messages.

Here are the dev PRs that should backported to 2.1 release branch:

#2566
#2574
#2547
#2612

[halter73]

Here are some examples of customer-reported issues or comments filed in the last 30 days that I think this also addresses. Some are closed because they are already fixed in dev:

#2546 (comment)
#2540
#2536 (comment)
#2536 (comment)
#2631

There are even more issues older than 30 days.

[muratg]

This is approved for 2.1.3.

[Eilon]

@halter73 - do you have an update on this patch issue?

[halter73]

The backport was merged into our release/2.1 branch 2 weeks ago with #2619. Closing.