[PATCH v2 07/28] buildman: Test the output with --list-error-boards

[sjg at google.com]

Add a test to cover this flag, which adds the name of each board to each
error/warning line.

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

Changes in v2:
- Move the 'boards' variables to the start of _CheckOutput()

 tools/buildman/test.py | 46 +++++++++++++++++++++++++++++-------------
 1 file changed, 32 insertions(+), 14 deletions(-)

Applied to u-boot-dm, thanks!