Remove thirdparty/unittest2 from webkitpy and require python2.7.

Tools/Scripts/webkitpy/common/config/urls_unittest.py

 # Copyright (C) 2012 Google Inc. All rights reserved.
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 #    * Redistributions of source code must retain the above copyright
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 # in the documentation and/or other materials provided with the
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 # this software without specific prior written permission.
 #
 # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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-import webkitpy.thirdparty.unittest2 as unittest
+import unittest
 
 from .urls import parse_bug_id, parse_attachment_id
 
 
 class URLsTest(unittest.TestCase):
     def test_parse_bug_id(self):
         # FIXME: These would be all better as doctests
         self.assertEqual(12345, parse_bug_id("http://webkit.org/b/12345"))
         self.assertEqual(12345, parse_bug_id("foo\n\nhttp://webkit.org/b/12345\nbar\n\n"))
         self.assertEqual(12345, parse_bug_id("http://bugs.webkit.org/show_bug.cgi?id=12345"))
@@ skipping 12 matching lines @@
     def test_parse_attachment_id(self):
         self.assertEqual(12345, parse_attachment_id("https://bugs.webkit.org/attachment.cgi?id=12345&action=review"))
         self.assertEqual(12345, parse_attachment_id("https://bugs.webkit.org/attachment.cgi?id=12345&action=edit"))
         self.assertEqual(12345, parse_attachment_id("https://bugs.webkit.org/attachment.cgi?id=12345&action=prettypatch"))
         self.assertEqual(12345, parse_attachment_id("https://bugs.webkit.org/attachment.cgi?id=12345&action=diff"))
 
         # Direct attachment links are hosted from per-bug subdomains:
         self.assertEqual(12345, parse_attachment_id("https://bug-23456-attachments.webkit.org/attachment.cgi?id=12345"))
         # Make sure secure attachment URLs work too.
         self.assertEqual(12345, parse_attachment_id("https://bug-23456-attachments.webkit.org/attachment.cgi?id=12345&t=Bqnsdkl9fs"))