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coverage: 93.234% (-0.05%) from 93.28%
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evanelias 
docker: minor debugging improvements, mostly for CI

This commit includes some minor improvements to Skeema's Docker interactions.
These changes are motivated by easier debugging of CI failures, but they can
also slightly improve workspace=docker troubleshooting as well.

* If a newly-created or just-restarted containerized database instance cannot
  be reached (after all retries/timeouts exhausted), the last 100 lines of
  the container's `docker logs` are now included in the error message.

* For database server flavors which still support the query cache, newly-
  created containerized database instances now have the query cache completely
  disabled with a size of 0. This is to rule out any query cache interactions
  from future troubleshooting, as e.g. some MariaDB bugs have implicated it in
  the past.

* Test suite container health monitoring from last month's commit 1ee3aa4 has
  been reverted. This logic was originally added prior to diagnosing the
  sporadic MariaDB CI issue which was eventually solved by a5ed51d. Since that
  issue did not actually cause the entire container to freeze or restart, the
  detection logic was not being triggered.

* Internal code for querying the database server processlist has been added.
  This is not currently used (outside of test coverage to confirm it works),
  but it could be helpful in future troubleshooting of CI problems.

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