In an effort to make some local commands faster, I propose we
exclude them from network dependent update step.

R=maruel@chromium.org
BUG=


Review URL: https://chromiumcodereview.appspot.com/11312143

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@166793 0039d316-1c4b-4281-b951-d872f2087c98