amulet doesn't always run with latest local charm revision

[Corey Bryant]

Amulet 1.10.0 appears to be caching the local charm such that if I make a code change locally and commit it, then run an amulet test, the charm code that gets run on the unit does not include that commit, and so on. I think I have to push and re-branch the code to get amulet to run against the latest. I'm sure there's a directory I could delete but I haven't found it. Also, side note, it looks like amulet is leaking files such as /tmp/amulet_deployment_* and /tmp/amulet-juju-deployer-*

Anyway, this makes development really difficult.