newcommitbot (WKR) requires a subversion checkout
https://bugs.webkit.org/show_bug.cgi?id=114309

Reviewed by Benjamin Poulain.

Directly talk to the subversion server instead of relying on a local checkout.
This allows us to run WKR off of a git clone.

* Scripts/webkitpy/tool/commands/newcommitbot.py:
(NewCommitBot.next_work_item):
(NewCommitBot.process_work_item):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148055 268f45cc-cd09-0410-ab3c-d52691b4dbfc