Revert "client: add quotes to the dict values"

Revert "client: add quotes to the dict values"

This commit is adding quotes that make keyring unusuable

eg:

```
client.john
        key: AQAN0RdbAAAAABAAH5D3WgMN9Rxw3M8jkpMIfg==
        caps: [mds] ''
        caps: [mgr] 'allow *'
        caps: [mon] 'allow rw'
        caps: [osd] 'allow rw'
```

Trying to import such a keyring and use it will result:

```
Error EACCES: access denied
```

Closes: https://bugzilla.redhat.com/show_bug.cgi?id=1623417
This reverts commit 424815501a0c6072234a8e1311a0fefeb5bcc222.

Signed-off-by: Guillaume Abrioux <gabrioux@redhat.com>