py33: 'dict_keys' object does not support indexing

In python 3, dict.keys() is a class of 'dict_keys', it does not
support indexing.

Cast the dict to list to get the "first" value of dict, which is
compatible with python 2&3.

Closes-Bug: #1229005

Change-Id: I561b7ada9e5ad936659a657b3161a9b93a15a788

novaclient/exceptions.py

@@ -206,7 +206,7 @@ def from_response(response, body, url, method=None):
         details = "n/a"
 
         if hasattr(body, 'keys'):
-            error = body[body.keys()[0]]
+            error = body[list(body)[0]]
             message = error.get('message', None)
             details = error.get('details', None)
 

novaclient/tests/v1_1/contrib/fakes.py

@@ -113,7 +113,7 @@ class FakeHTTPClient(fakes.FakeHTTPClient):
 
     def post_os_baremetal_nodes_1_action(self, **kw):
         body = kw['body']
-        action = body.keys()[0]
+        action = list(body)[0]
         if action == "add_interface":
             return (
                 200, {}, {

novaclient/tests/v1_1/fakes.py

@@ -488,7 +488,7 @@ class FakeHTTPClient(base_client.HTTPClient):
         _body = None
         resp = 202
         assert len(body.keys()) == 1
-        action = body.keys()[0]
+        action = list(body)[0]
         if action == 'reboot':
             assert body[action].keys() == ['type']
             assert body[action]['type'] in ['HARD', 'SOFT']