Fix update exclusions for gclient

Regex matched substrings, so 'gclient', and 'gclient g' were
excluded.

TBR=maruel@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11370007

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@166799 0039d316-1c4b-4281-b951-d872f2087c98

gclient

@@ -5,7 +5,7 @@
 
 base_dir=$(dirname "$0")
 
-if ! [[ "grep fetch cleanup diff" =~ "$1" ]]; then
+if ! [[ "#grep#fetch#cleanup#diff#" =~ "#$1#" ]]; then
   "$base_dir"/update_depot_tools
 fi