Summary:
Before this PR, the following command prints only the default column
family's information in the end:
```
ldb --db=. --hex manifest_dump --verbose
```

We should print all column families instead.

Pull Request resolved: https://github.com/facebook/rocksdb/pull/9719

Test Plan:
`make check` makes sure nothing breaks.

Generate a DB, use the above command to verify all column families are
printed.

Reviewed By: akankshamahajan15

Differential Revision: D34992453

Pulled By: riversand963

fbshipit-source-id: de1d38c4539cd89f74e1a6240ad7a6e2416bf198