- One-off containers were included in the warning log messages, which can
make for unreadable output when there are lots (as there often are).
- Compose was attempting to recreate one-off containers as normal
containers when migrating.
Fixed by implementing the exact naming logic from before we used labels.
Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>
- Rename `migration` module to `legacy` to make its legacy-ness explicit
- Move `check_for_legacy_containers` into `legacy` module
- Fix migration test so it can be run in isolation
Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>