Altered API parameters such that authentication works again with the latest version of Rackspace Cloud Servers.

I have no idea why this would be necessary, just reverse engineered the calls from novaclient and they looked like this.

Author: keesvanbochove

dnsclient/client.py

@@ -433,11 +433,11 @@ def _plugin_auth(self, auth_url):
     def _v2_auth(self, url):
         """Authenticate against a v2.0 auth service."""
         body = {"auth": {
-                "passwordCredentials": {"username": self.user,
-                                        "password": self.password}}}
+                "RAX-KSKEY:apiKeyCredentials": {"username": self.user,
+                                        "apiKey": self.password}}}
 
         if self.projectid:
-            body['auth']['tenantName'] = self.projectid
+            body['auth']['RAX-KSKEY:apiKeyCredentials']['tenantName'] = self.projectid
 
         self._authenticate(url, body)