This caused problems for repo-based projects that need to install the
standard Change-Id commit-msg hook.

With the commit-msg hook gone, we can also reinstate the --template
argument to 'git clone'.

BUG=235215
R=iannucci@chromium.org, ilevy@chromium.org, maruel@chromium.org

Review URL: https://codereview.chromium.org/18083033

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@211464 0039d316-1c4b-4281-b951-d872f2087c98