Paul, We have now uploaded bustle to Unstable. I didn't notice that bustle wasn't in Testing so I did another upload today. Please consider hinting bustle in faster since I'm not sure whether there are 5 days left before the Soft Freeze.
Note that bustle is not currently providing a bustle-pcap binary package so dbus-test-runner still needs its autopkgtest removed or modified. Thank you, Jeremy Bícha
