Support filtering on zone import/export list

List operations should add the task_type criterion to the user
provided criterion.

This patch also fixes the neutron-tempest-plugin-designate-scenario
job to use the ussuri version neutron-tempest-plugin-designate-scenario-ussuri.
This is required for this patch to merge.

Change-Id: I983d930f975c109cce24a9587bba6db563b3f19f
Launchpad: 1926058
(cherry picked from commit fb9f0b33d3)

.zuul.yaml

@@ -150,7 +150,7 @@
       - release-notes-jobs-python3
     check:
       jobs:
-        - neutron-tempest-plugin-designate-scenario
+        - neutron-tempest-plugin-designate-scenario-victoria
     gate:
       queue: designate
     experimental:

designate/central/service.py

@@ -2817,9 +2817,13 @@ class Service(service.RPCService):
         target = {'tenant_id': context.project_id}
         policy.check('find_zone_imports', context, target)
 
-        criterion = {
-            'task_type': 'IMPORT'
-        }
+        if not criterion:
+            criterion = {
+                'task_type': 'IMPORT'
+            }
+        else:
+            criterion['task_type'] = 'IMPORT'
+
         return self.storage.find_zone_imports(context, criterion, marker,
                                       limit, sort_key, sort_dir)
 
@@ -2886,9 +2890,13 @@ class Service(service.RPCService):
         target = {'tenant_id': context.project_id}
         policy.check('find_zone_exports', context, target)
 
-        criterion = {
-            'task_type': 'EXPORT'
-        }
+        if not criterion:
+            criterion = {
+                'task_type': 'EXPORT'
+            }
+        else:
+            criterion['task_type'] = 'EXPORT'
+
         return self.storage.find_zone_exports(context, criterion, marker,
                                       limit, sort_key, sort_dir)