Add an `mb audit` command to track the GYP->GN progress.

Add an `mb audit` command to track the GYP->GN progress.

This adds a command by which we can track
  - which builders no longer exist but are in the config file
    and should be purged
  - which builders aren't in the config file, meaning we haven't
    looked at them
  - which builders still need to have their flags checked.
  - which builders are still on GYP

R=estaab@chromium.org
BUG=432967, 481692
Committed: https://crrev.com/867bcf4ae6b7e8e64b72cfa4cef2ab7cdd2239cf
Cr-Commit-Position: refs/heads/master@{#381094}

[Dirk Pranke, 2016-03-12 03:02:33]

Description was changed from

==========
Add an `mb audit` command to track the GYP->GN progress.

This adds a command by which we can track
  - which builders no longer exist but are in the config file
    and should be purged
  - which builders aren't in the config file, meaning we haven't
    looked at them
  - which builders still need to have their flags checked.
  - which builders are still on GYP

R=estaab@chromium.org
BUG=432967, 481692
==========

to

==========
Add an `mb audit` command to track the GYP->GN progress.

This adds a command by which we can track
  - which builders no longer exist but are in the config file
    and should be purged
  - which builders aren't in the config file, meaning we haven't
    looked at them
  - which builders still need to have their flags checked.
  - which builders are still on GYP

R=estaab@chromium.org
BUG=432967, 481692
==========

[Dirk Pranke, 2016-03-12 03:12:30]

Patchset #1 (id:1) has been deleted

[estaab, 2016-03-12 04:07:27]

lgtm

https://codereview.chromium.org/1794573002/diff/20001/tools/mb/mb.py
File tools/mb/mb.py (right):

https://codereview.chromium.org/1794573002/diff/20001/tools/mb/mb.py#newcode430
tools/mb/mb.py:430: for builder in buildbot_builders:
nit:
missing_in_config = sorted(set(buildbot_builders) - set(config_builders))

you could probably just operate on sets starting at 409 and just sort at the
end.

[Dirk Pranke, 2016-03-14 20:44:58]

The CQ bit was checked by dpranke@chromium.org

[Dirk Pranke, 2016-03-14 20:44:58]

The patchset sent to the CQ was uploaded after l-g-t-m from estaab@chromium.org
Link to the patchset: https://codereview.chromium.org/1794573002/#ps40001
(title: "update w/ review feedback, clean up")

[commit-bot: I haz the power, 2016-03-14 20:45:20]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1794573002/40001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1794573002/40001

[Dirk Pranke, 2016-03-14 20:46:12]

On 2016/03/12 04:07:27, estaab wrote:
> you could probably just operate on sets starting at 409 and just sort at the
end.

Good call. I thought about that earlier but in an earlier incarnation of this
change it
was more awkward to use sets because I was printing things incrementally. Now
that everything is cleaned up using sets does make more sense.

[commit-bot: I haz the power, 2016-03-14 22:28:39]

Description was changed from

==========
Add an `mb audit` command to track the GYP->GN progress.

This adds a command by which we can track
  - which builders no longer exist but are in the config file
    and should be purged
  - which builders aren't in the config file, meaning we haven't
    looked at them
  - which builders still need to have their flags checked.
  - which builders are still on GYP

R=estaab@chromium.org
BUG=432967, 481692
==========

to

==========
Add an `mb audit` command to track the GYP->GN progress.

This adds a command by which we can track
  - which builders no longer exist but are in the config file
    and should be purged
  - which builders aren't in the config file, meaning we haven't
    looked at them
  - which builders still need to have their flags checked.
  - which builders are still on GYP

R=estaab@chromium.org
BUG=432967, 481692
==========

[commit-bot: I haz the power, 2016-03-14 22:28:40]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2016-03-14 22:30:10]

Description was changed from

==========
Add an `mb audit` command to track the GYP->GN progress.

This adds a command by which we can track
  - which builders no longer exist but are in the config file
    and should be purged
  - which builders aren't in the config file, meaning we haven't
    looked at them
  - which builders still need to have their flags checked.
  - which builders are still on GYP

R=estaab@chromium.org
BUG=432967, 481692
==========

to

==========
Add an `mb audit` command to track the GYP->GN progress.

This adds a command by which we can track
  - which builders no longer exist but are in the config file
    and should be purged
  - which builders aren't in the config file, meaning we haven't
    looked at them
  - which builders still need to have their flags checked.
  - which builders are still on GYP

R=estaab@chromium.org
BUG=432967, 481692

Committed: https://crrev.com/867bcf4ae6b7e8e64b72cfa4cef2ab7cdd2239cf
Cr-Commit-Position: refs/heads/master@{#381094}
==========

[commit-bot: I haz the power, 2016-03-14 22:30:11]

Patchset 2 (id:??) landed as
https://crrev.com/867bcf4ae6b7e8e64b72cfa4cef2ab7cdd2239cf
Cr-Commit-Position: refs/heads/master@{#381094}