It is possible that a node will have no owned token ranges
in some keyspaces based on their replication strategy,
if the strategy is configured to have no replicas in
this node's data center.
In this case we should go ahead with cleanup that will
effectively delete all data.
Note that this is current very inefficient as we need
to filter every partition and drop it as unowned.
It can be optimized by either special casing this case
or, better, use skip forward to the next owned range.
This will skip to end-of-stream since there are no
owned ranges.
Fixes#13634
Also, add a respective rest_api unit test
Closes#13849
* github.com:scylladb/scylladb:
test: rest_api: test_storage_service: add test_storage_service_keyspace_cleanup_with_no_owned_ranges
compaction_manager: perform_cleanup: handle empty owned ranges
3d75158fda