[nova] fix pagination of hypervisors.List() #3223
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This is a mildly backwards-incompatible change, but since most people only use this API on the level of pagination.Pager, it ought not be a big deal in practice.
Closes #3222.
FYI, a mildly different implementation of the same change has been tested against productive clusters of a sufficient size (more than 1000 hypervisors) in sapcc/limes#585.