- 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).

- Add Zesty charm series metadata.

- Remove Precise charm series metadata if present.

- Remove Precise Amulet test definitions if present.

Change-Id: Ia81b03da3f2d4c5a36a147c152123b490843c0f6