Add mistral APIException as a Recoverable Exception

currently we can't handle api exceptions, so add mistral api
exception to Recoverable list

Change-Id: I7afeb0b1c900b9fb1854a9eebc768acf0a9c4c89
Closes-Bug: #1483653

_50_mistral.py.example

@@ -1,4 +1,11 @@
+from mistraldashboard import exceptions
+
 DASHBOARD = 'mistral'
 ADD_INSTALLED_APPS = ['mistraldashboard']
 DEFAULT = True
-ADD_EXCEPTIONS = {}
+
+ADD_EXCEPTIONS = {
+    'recoverable': exceptions.RECOVERABLE,
+    'not_found': exceptions.NOT_FOUND,
+    'unauthorized': exceptions.UNAUTHORIZED,
+}

mistraldashboard/exceptions.py

@@ -0,0 +1,20 @@
+# Copyright 2015 Huawei Technologies Co., Ltd.
+#
+#    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.
+
+from mistralclient.api.base import APIException
+from openstack_dashboard import exceptions
+
+NOT_FOUND = exceptions.NOT_FOUND
+RECOVERABLE = exceptions.RECOVERABLE + (APIException,)
+UNAUTHORIZED = exceptions.UNAUTHORIZED