Improve unit test and fuzzer documentation story

* Update **test** directory description to README.md.
* Add ** fuzz** directory description to README.md.
* Add unit test and fuzzer make targets to `make help`
* Change showboards to print-boards to be more consistent
* Change showboards to use auto pretty print
* Add print-tests, print-host-tests, and print-host-fuzzers
  This is necessary to remove the ambiguity about what a special
  name is for a given unit test.

Documentation Story:
The idea is to give a brief overview of what the test and fuzz
directories are in README.md.
README.md also mentions you should see `make help` for more detail.
Running `make help` shows you more general test/fuzz commands,
including the print-* commands.
Running the print-* commands show you exact target names for all
possible unit/fuzz test (both the build-only and run target names).

BRANCH=none
BUG=none
TEST=make help
TEST=make print-tests
TEST=make print-host-tests
TEST=make print-host-fuzzers
TEST=make print-host-fuzzers | cat
TEST=make print-boards
TEST=make print-boards | cat
TEST=make buildall -j

Change-Id: I34b68196ac635ba71a1d45ceb5d35a3b36fd129f
Signed-off-by: Craig Hesling <hesling@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/1684714
Reviewed-by: Aseda Aboagye <aaboagye@chromium.org>
Reviewed-by: Daisuke Nojiri <dnojiri@chromium.org>

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