Fix retrieval of reprocessing tasks

Calling GET /v2/task/reprocesses with python-cloudkittyclient was
returning Internal Server Error, with the following API trace:

      File "/var/lib/kolla/venv/lib/python3.6/site-packages/cloudkitty/api/v2/task/reprocess.py", line 259, in get
        order, ACCEPTED_GET_REPROCESSING_REQUEST_ORDERS)
    TypeError: __init__() takes from 1 to 3 positional arguments but 4 were given

This was because http_exceptions.BadRequest was given multiple arguments
(similar to LOG.* methods) instead of a single string.

Another issue is that python-cloudkittyclient sends the "DESC" order
while the API only supports "desc" and "asc". Convert to lower case for
compatibility.

Change-Id: Id1145adff82bc9a01e4eb0f306f0bfa535142459

cloudkitty/api/v2/task/reprocess.py

@@ -286,10 +286,14 @@ class ReprocessSchedulerGetApi(base.BaseResource):
         if not isinstance(scope_ids, list):
             scope_ids = [scope_ids]
 
+        # Some versions of python-cloudkittyclient can send the order in upper
+        # case, e.g. "DESC". Convert it to lower case for compatibility.
+        order = order.lower()
+
         if order not in ACCEPTED_GET_REPROCESSING_REQUEST_ORDERS:
             raise http_exceptions.BadRequest(
-                "The order [%s] is not valid. Accepted values are %s.",
-                order, ACCEPTED_GET_REPROCESSING_REQUEST_ORDERS)
+                "The order [%s] is not valid. Accepted values are %s." %
+                (order, ACCEPTED_GET_REPROCESSING_REQUEST_ORDERS))
 
         schedules = self.schedule_reprocessing_db.get_all(
             identifier=scope_ids, remove_finished=False,

releasenotes/notes/reprocess-get-fix-f2bd1f2f9e2d640e.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix retrieval of reprocessing tasks which was returning ``Internal Server
+    Error``.