[PATCH v2 26/28] buildman: Add an option to ignore migration warnings

[sjg at google.com]

These are becoming more common now. They cause boards to show warnings
which can be mistaking for compiler warnings.

Add a buildman option to ignore them. This option works only with the
summary option (-s). It does not affect the build process.

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

Changes in v2:
- Add new patch to ignore migration warnings

 tools/buildman/README     |   2 +-
 tools/buildman/builder.py |  12 +++-
 tools/buildman/cmdline.py |   5 +-
 tools/buildman/control.py |   3 +-
 tools/buildman/test.py    | 120 ++++++++++++++++++++++++++++----------
 5 files changed, 107 insertions(+), 35 deletions(-)

Applied to u-boot-dm, thanks!