[PATCH v4 55/83] buildman: Add a test for --boards

[Simon Glass]

Add a simple functional test for the --boards option. Fix the example in
the docs while we are here. Also improve the docs for Builder.count so it
is clearer what it contains.

Signed-off-by: Simon Glass <sjg at chromium.org>
---

(no changes since v2)

Changes in v2:
- Use snake case for tests

 tools/buildman/builder.py   |  3 ++-
 tools/buildman/buildman.rst |  2 +-
 tools/buildman/func_test.py | 11 +++++++++++
 3 files changed, 14 insertions(+), 2 deletions(-)

Applied to u-boot-dm, thanks!