- Remove Precise-Icehouse Amulet test definitions if they exist.
- Add Xenial-Newton Amulet test definitions, using ODL BE.
- Add Yakkety-Newton Amulet test definitions, using ODL BE.
- Use the percona-cluster charm in tests instead of the mysql charm.
- Also adjust py hash bangs to use env python.
Closes-Bug: 1632533
Change-Id: If10e49a9c45bc7fcd1eb073dcdccabed6c37a958