Make dup_it_worker.py executable

BUG=chromium:724619
TEST=None

Change-Id: I77b56255ca8b08e1cf1334417b7010ad01bdc9c3
Reviewed-on: https://chromium-review.googlesource.com/516822
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Commit-Queue: Prathmesh Prabhu <pprabhu@chromium.org>
Tested-by: Prathmesh Prabhu <pprabhu@chromium.org>
diff --git a/bin/dup_it_worker.py b/bin/dup_it_worker.py
old mode 100644
new mode 100755