Different cell filter.
A scheduler hint of ‘different_cell’ with a value of a full cell name may be
specified to route a build away from a particular cell.
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class DifferentCellFilter
Bases: nova.cells.filters.BaseCellFilter
Different cell filter. Works by specifying a scheduler hint of
‘different_cell’. The value should be the full cell path.
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filter_all(cells, filter_properties)
Override filter_all() which operates on the full list
of cells...