Lots of our phony Compose files launch pointless long-lived processes
so we can assert on state. However, this means they often don't respond
well to signals on their own, requiring Compose to timeout and kill
them when doing a `down`.
Add in lots of `init: true` where appropriate so that we don't block
for no reason while running E2E tests all over the place.
Additionally, a couple tests have gotten a cleanup so they don't leave
behind containers. I still want to build this into the framework in
the future, but this is easier for the moment and won't cause any
trouble in the future.
Signed-off-by: Milas Bowman <milas.bowman@docker.com>