Update DatastoreNotFound status code to 404

Explicitly specifying DatastoreNotFound exception to return http
status code 404. Previously we weren't specifying the status code
for the exception and were returning 400 by default. The unit test
depending on the previous status code has been updated to reflect
this change.

Closes-Bug: 1415031
Change-Id: I30bd97d53d1d51704133eb63e25f32a20cf0d9a1

trove/common/wsgi.py

@@ -338,7 +338,8 @@ class Controller(object):
             exception.DatabaseNotFound,
             exception.QuotaResourceUnknown,
             exception.BackupFileNotFound,
-            exception.ClusterNotFound
+            exception.ClusterNotFound,
+            exception.DatastoreNotFound,
         ],
         webob.exc.HTTPConflict: [
             exception.BackupNotCompleteError,

trove/tests/api/backups.py

@@ -245,7 +245,7 @@ class ListBackups(object):
     @test
     def test_backup_list_filter_datastore_not_found(self):
         """Test list backups and filter by datastore."""
-        assert_raises(exceptions.BadRequest, instance_info.dbaas.backups.list,
+        assert_raises(exceptions.NotFound, instance_info.dbaas.backups.list,
                       datastore='NOT_FOUND')
 
     @test