revlist: add `ObjectsWithStorageForIgnores` method

`ObjectsWithStorageForIgnores` is the same as `Objects`, but a
secondary storage layer can be provided, to be used to finding the
full set of objects to be ignored while finding the reachable objects.
This is useful when the main `s` storage layer is slow and/or remote,
while the ignore list is available somewhere local.

Issue: #909
Signed-off-by: Jeremy Stribling <strib@alum.mit.edu>

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