- Sync charm helpers if applicable.

- Fix test executable hashbags for virtualenv prep.

- Add Yakkety-Newton Amulet test definitions.

- Prep Xenial-Ocata Amulet test definitions (not yet enabled).

- Prep Zesty-Ocata Amulet test definitions (not yet enabled).

- Remove Precise charm series metadata if present.

- Remove Precise Amulet test definitions if present.

Change-Id: I367b6e9e22464c0b85e71ad330234477699835e0