Add compose-bindata validation to default.

Signed-off-by: Daniel Nephin <dnephin@docker.com>

hack/validate/default

@@ -16,3 +16,4 @@ export SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 . $SCRIPTDIR/vet
 . $SCRIPTDIR/changelog-well-formed
 . $SCRIPTDIR/changelog-date-descending
+. $SCRIPTDIR/compose-bindata