policies: Fix getting replicas in TestHostPolicy_TokenAware_DCAwareRR2

This commit fixes the next error:
```
type *tokenAwareHostPolicy has no field or method keyspaces
```

which was introduced with 47e1472 after merging
#22

Commit 9867ae9 removed field used in the test and later change was
not reflected during ongoing merges.

AUTHORS

@@ -113,3 +113,4 @@ Thomas Meson <zllak@hycik.org>
 Martin Sucha <martin.sucha@kiwi.com>; <git@mm.ms47.eu>
 Pavel Buchinchik <p.buchinchik@gmail.com>
 Rintaro Okamura <rintaro.okamura@gmail.com>
+Ivan Boyarkin <ivan.boyarkin@kiwi.com>; <mr.vanboy@gmail.com>