sheriff-bot should know who the gardeners/sheriffs are
https://bugs.webkit.org/show_bug.cgi?id=105698

Patch by Alan Cutter <alancutter@chromium.org> on 2013-01-01
Reviewed by Eric Seidel.

Added a "sheriffs" command to sheriffbot to fetch the current Chromium Webkit sheriffs.

* Scripts/webkitpy/tool/bot/irc_command.py:
(Current):
(Current._retrieve_webkit_sheriffs):
(Current.execute):
* Scripts/webkitpy/tool/bot/irc_command_unittest.py:
(IRCCommandTest.test_current):
* Scripts/webkitpy/tool/bot/testdata/webkit_sheriff_0.js: Added.
* Scripts/webkitpy/tool/bot/testdata/webkit_sheriff_1.js: Added.
* Scripts/webkitpy/tool/bot/testdata/webkit_sheriff_2.js: Added.
* Scripts/webkitpy/tool/bot/testdata/webkit_sheriff_malformed.js: Added.
* Scripts/webkitpy/tool/bot/testdata/webkit_sheriff_zero.js: Added.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@138603 268f45cc-cd09-0410-ab3c-d52691b4dbfc