Exclude some gclient commands from auto-update

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

gclient

@@ -5,6 +5,8 @@
 
 base_dir=$(dirname "$0")
 
-"$base_dir"/update_depot_tools
+if ! [[ "grep fetch cleanup diff" =~ "$1" ]]; then
+  "$base_dir"/update_depot_tools
+fi
 
 PYTHONDONTWRITEBYTECODE=1 exec python "$base_dir/gclient.py" "$@"