Issue and patchset can only be int, so store them as ints.
This fixes git cl comment, which was broken by r152756.

R=petermayo@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/10894019

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@153885 0039d316-1c4b-4281-b951-d872f2087c98