read/delete cluster/feed/process in AuthorizationTest

Response with authentication error has status *400*, not *405*

Example of response message:
```
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<result>
    <status>FAILED</status>
    <message>AUTHENTICATION : E1400 : Unauthorized proxyuser [falcon] for user [user2], not in proxyuser groups
    </message>
    <requestId>fa620fe8-feea-4a43-85c5-dc0e52b3929a</requestId>
</result>
```

There was a mistake in a test, "delete()" method was used instead of "getEntityDefinition()".