The test-case creates a S3-backed ks, populates it with table and data,
then forces flush to make sstables appear on the backend. Then it
updates the registry by marking all the objects as 'removing' so that on
next boot they will be garbage-collected.
After reboot check that the table is "empty" and also validate that the
backend doesn't have the corresponding objects on board for real
Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>
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