Admin: show open and closed indices in _cat/indices

When asking for `GET /_cat/indices?v`, you can now retrieve closed indices in addition to opened ones.

```
health status index              pri rep docs.count docs.deleted store.size pri.store.size
yellow open   .marvel-2014.05.21   1   1       8792            0     21.7mb         21.7mb
       close  test
yellow open   .marvel-2014.05.22   1   1       3871            0     10.7mb         10.7mb
red    open   .marvel-2014.05.27   1   1
```

Closes #7907.