fix KeyError when credential is invalid

We assume the keystoneauth1.exceptions.HttpError.response has
a field named `description`, however, it doesn't.[1]

We should use `details` instead. [2]

[1]. https://github.com/openstack/keystoneauth/blob/2.6.0/keystoneauth1/exceptions/http.py#L65-L85
[2]. https://github.com/openstack/keystoneauth/blob/2.6.0/keystoneauth1/exceptions/http.py#L391

Change-Id: I77846c6cafc0f73a1c6cf20a17fe44ba1284eef1
Closes-Bug: #1577290

aodhclient/shell.py

@@ -13,6 +13,8 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from __future__ import print_function
+
 import logging
 import os
 import sys
@@ -129,13 +131,8 @@ class AodhShell(app.App):
         return self._client
 
     def clean_up(self, cmd, result, err):
-        if err and isinstance(err, exceptions.HttpError):
-            try:
-                error = err.response.json()
-            except Exception:
-                pass
-            else:
-                print(error['description'])
+        if isinstance(err, exceptions.HttpError) and err.details:
+            print(err.details, file=sys.stderr)
 
     def configure_logging(self):
         if self.options.debug:

aodhclient/tests/unit/test_shell.py

@@ -0,0 +1,39 @@
+# Copyright 2016 Hewlett Packard Enterprise Development Company, L.P.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+import sys
+
+from keystoneauth1 import exceptions
+import mock
+import six
+import testtools
+
+from aodhclient import shell
+
+
+class CliTest(testtools.TestCase):
+
+    @mock.patch('sys.stderr', six.StringIO())
+    def test_cli_http_error_with_details(self):
+        shell.AodhShell().clean_up(
+            None, None, exceptions.HttpError('foo', details='bar'))
+        stderr_lines = sys.stderr.getvalue().splitlines()
+        self.assertEqual(1, len(stderr_lines))
+        self.assertEqual('bar', stderr_lines[0])
+
+    @mock.patch('sys.stderr', six.StringIO())
+    def test_cli_http_error_without_details(self):
+        shell.AodhShell().clean_up(None, None, exceptions.HttpError('foo'))
+        stderr_lines = sys.stderr.getvalue().splitlines()
+        self.assertEqual(0, len(stderr_lines))