Botond Dénes e4c1c4f052 flat_mutation_reader: add make_flat_mutation_reader_from_fragments() overload with range and slice ...

To be able to support this new overload, the reader is made
partition-range aware. It will now correctly only return fragments that
fall into the partition-range it was created with. For completeness'
sake and to be able to test it, also implement
`fast_forward_to(const dht::partition_range)`. Slicing is done by
filtering out non-overlapping fragments from the initial list of
fragments. Also add a unit test that runs it through the mutation_source
test suite.

(cherry picked from commit 51e81cf027)

2019-05-06 11:19:04 +03:00

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