A bugfix release to improve the robustness around the configuration hook:
- tests: fix interfaces-cups-control for zesty
- configstate,hookstate: timeout the configure hook after 5 mins, report failures
- packaging: rename the file shipping snap-confine AA profile to workaround dpkg bug #858004
- many: ignore configure hook failures on core refresh to ensure upgrades are always possible
- snapstate: restart as needed if we undid unlinking aka relinked core or kernel snap