Changes:
2019-04-02 vadimsh@chromium.org [lucicfg] Rename 'recipe = ...' field into 'executable = ...'.
2019-04-02 vadimsh@chromium.org [lucicfg] Implement semantic diff of CQ configs.
2019-04-02 vadimsh@chromium.org [lucicfg] Accept non-standard text protos as input of semantic-diff.
2019-04-02 vadimsh@chromium.org [lucicfg] Remove header IDs from normalized Milo configs.
2019-04-02 vadimsh@chromium.org [lucicfg] Implement semantic diff of Milo configs.
2019-04-02 vadimsh@chromium.org [lucicfg] Implement semantic diff of Scheduler configs.

TBR=tandrii@chromium.org

Change-Id: I1ace2edb3a2b686d069dbfb3d753ecc2540f01fd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/1549945Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>