We can no longer list deleted databases because the server no longer
knows about them, and we now have UUIDs that are useful to know about,
so change the detailed listing of databases to return UUID instead of
possible deleted at time.
Now that the database paths use UUIDs instead of names+generation ids,
and that IoxObjectStore checks there are no files in a directory before
it'll create a database directory (and has tests for that).
Running a server is now using `influxdb_iox run MODE [args]`, e.g.
`influxdb_iox run query --server-id 1`. Another mode that will follow
soon is `router`.
The old syntax `influxdb_iox run [args]` (w/o the mode part) is still
supported but a deprecation note will be printed.