
We have implemented the cleaning prepare/tear_down, but haven't implemented fetching/running in-band clean steps. This change moves the cleaning logic from AgentDeployMixin to AgentBaseMixin, where it arguably belongs. In a follow-up patch I'm planning to reduce the number of mix-ins we currently have, but that won't be backportable. Change-Id: Ibc5610b14cea487d26191249e5c0333fdcd4b914