We need a tool that will help in evaluating current HWTest
coverage in the lab, and finding gaps.  BVT test coverage
requirements for release builders is relatively consistent
and well understood, so the tool should focus on non-release
builders, especially the CQ and PFQ.

The tool needs to be able to gather and report the following
information about every non-release builder that is configured
to run tests:
  * From the chromite config:  The board the builder builds for.
  * From the chromite config:  All test suites the builder will run.
  * From the chromite config:  The pool the suites will run against.
  * From the AFE database:  The number of DUTs for the selected pool
    and board.
  * From the AFE database:  The number of DUTs in the board's
    'suites' pool.
  * From CIDB:  various run time statistics for HWTest phases;
    at minimum, include average run time over the past month or so.
  * From CIDB:  for each HWTest phase statistic, the analogous
    statistic for the builder as a whole.
  * From GoldenEye:  The board family of the builder.

The tool should also gather information about coverage gaps by
listing the following information about all boards _not_ tested
in a non-release builder:
  * From Goldeneye:  The board family.
  * From the AFE database:  The number of DUTs in the board's
    'suites' pool.

Additional information that may be helpful:
  * The number of tests in each suite.

The board->family information from GoldenEye can be found
here (among other locations):
    gs://chromeos-build-release-console/boards.json
Each entry in the file has a "reference_group" field.