Code review comment for lp://qastaging/~ed-leafe/nova/scheduler-multifilter

We're doing a bunch on testing on zones as a whole this sprint (ending next week) and have already spotted a number of regressions. I suspect there'll be several bug fix patches following behind this shortly.

Since some of these merges have already made it in, zones in Diablo would be busted anyway. I'm just afraid of introducing regressions in other areas of the code.