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docker: reduce resource consumption of ephemeral databases

This commit reduces the memory and disk consumption of ephemeral Dockerized
database servers created by Skeema's workspace=docker option, as well as by
Skeema's integration test suites. Newly created Dockerized instances now have
the following additional settings applied:

* Use 32MB InnoDB buffer pool (instead of default of 128MB)
* Use 16MB InnoDB redo log files each (instead of default of 48MB-96MB each)
* Disable performance_schema, which reduces memory consumption by upwards of
  400MB in MySQL 5.6 (less in other flavors, but still noticeable)

These settings are only applied to newly-created Docker containers. If you
have existing Skeema-managed containers (either from workspace=docker without
docker-cleanup=destroy, or from Skeema integration tests), you must manually
remove them first if you wish for Skeema to recreate them with the new lower
resource usage settings.

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