When we call merge_keyspaces, we end up calling db.add_keyspace, which means we
don't do parts of creation of a keyspace - like creating the directory. This works
in some situations where all the work was already done, but not in others.
We should be calling create_keyspace instead, which will take care of all that
for us. That will include creating a directory when one is needed.
Signed-off-by: Glauber Costa <glommer@cloudius-systems.com>
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