Converting to unittest2 so we can use assertItemsEqual, making tests
not dependent on order of items.
https://bugs.webkit.org/show_bug.cgi?id=106532

Before:
Ran 1733 tests in 38.385s
FAILED (failures=1, errors=22)

After:
Ran 1733 tests in 32.298s
FAILED (failures=0, errors=22)

Patch by Tim 'mithro' Ansell <mithro@mithis.com> on 2013-01-10
Reviewed by Eric Seidel.

* Scripts/webkitpy/common/checkout/scm/scm_unittest.py:
* Scripts/webkitpy/thirdparty/__init__.py:
(AutoinstallImportHook._install_unittest2):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@139294 268f45cc-cd09-0410-ab3c-d52691b4dbfc