git-cl: change the git-cl-repo dir to git_cl_repo so that we can import
git-cl: change the git-cl-repo dir to git_cl_repo so that we can import

python does not seem to be able to import for a dir with dashes in it.

BUG=none
TEST=Ran git-cl help and verified it worked and new dir was created.

Review URL: http://codereview.chromium.org/3530012

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@61694 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools