Comment 32 for bug 1348663

That's correct, but whether a machine will get another address depends on the lease duration as well.
We didn't have issues with machines leaking leases AFAIK, only containers so that's why I suggested initially to fix it for containers only. But it should be OK to do it for machines as well.

We're testing on trusty and vivid first, and wily should come after, yes.
Do you think we should prevent the "ifdown on shutdown" behavior by default for wily, unless a feature flag is set?