storage: fix partial reformat not removing all candidate partitions #2094
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When reformatting a disk that has in-use (i.e., mounted) partitions, we do a "partial" reformat, which means we attempt to delete all the partitions that are not in use.
Unfortunately, the implementation was not correct. While iterating over the partitions, calling delete_partition affects the iterator. As a consequence, some partitions that should have been removed end up preserved.
Fixed by iterating over a copy of the container.
LP:#2083322