tast: Exclude Tast private bundles from images.

BUG=chromium:875141
TEST=build_image --board=betty test

Change-Id: I523b605c7c2a18297c0c8a44f3ad0cae38e3d6d9
Reviewed-on: https://chromium-review.googlesource.com/1404605
Commit-Ready: Shuhei Takahashi <nya@chromium.org>
Tested-by: Shuhei Takahashi <nya@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
diff --git a/common.sh b/common.sh
index fa1aa5c..31c3735 100644
--- a/common.sh
+++ b/common.sh
@@ -442,6 +442,8 @@
   *.h++
   *.hxx
   */.keep*
+  /build/libexec/tast
+  /build/share/tast
   /etc/init.d
   /etc/runlevels
   /etc/selinux/intermediates