Remove a bunch of unused webkitpy code from tool/, common/checkout/ and common/config/

Remove a bunch of unused webkitpy code.

This patch removes a bunch of webkit-patch steps and related code that was primarily concerned w/ interacting w/ Bugzilla and/or other WebKit-based ports. Among the things/files removed: the Checkout module, the DeprecatedPort module, and a bunch of steps.

This patch also promotes all the remaining webkit-patch commands that are meant to be run by the user to the main 'webkit patch help' list. Now 'help --all-commands' lists the main commands plus the internal commands like rebaseline-test-internal.

In theory, no one was using any of this stuff so it should be safe to remove. I guess we'll see :).


BUG=
R=ojan@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=159595

[ojan, 2013-10-12 00:22:36]

lgtm

rs=me

[commit-bot: I haz the power, 2013-10-12 00:30:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dpranke@chromium.org/27055003/1

[commit-bot: I haz the power, 2013-10-12 08:49:25]

Retried try job too often on win_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_blink_...

[Dirk Pranke, 2013-10-14 18:37:41]

Committed patchset #1 manually as r159595 (presubmit successful).