Support closing connections when QUIC connection drop

[lijunwangs]

Problem

When we increase connection idle time out, the connections opened in earlier connection cache instance will take longer time to reach timeout and close. This cause problems for applications recreating connection cache in lower level APIs. As their new connection attempt are blocked by connection limit per peer.

Summary of Changes

This support gracefully closing the client connections when the connection cache is dropped.

Fixes #

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 73.07692% with 7 lines in your changes missing coverage. Please review.

Project coverage is 83.3%. Comparing base (4439a5e) to head (b1deab0).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6857   +/-   ##
=======================================
  Coverage    83.3%    83.3%           
=======================================
  Files         853      853           
  Lines      378270   378296   +26     
=======================================
+ Hits       315267   315334   +67     
+ Misses      63003    62962   -41     

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