Add retry logic when deleting logical port and logical switch

When deleting a logical port or logical switch, the backend may
have transient inconsistency due to split internal update transactions.
For now, adding the retry logical at the plugin side to solve
this problem.

Change-Id: I008d5759d490bbd364731f94b916c179af50491b

vmware_nsx/nsxlib/v3/__init__.py

@@ -90,6 +90,8 @@ def create_logical_switch(display_name, transport_zone_id, tags,
     return client.create_resource(resource, body)
 
 
+@utils.retry_upon_exception_nsxv3(nsx_exc.StaleRevision,
+                                  max_attempts=cfg.CONF.nsx_v3.retries)
 def delete_logical_switch(lswitch_id):
     resource = 'logical-switches/%s?detach=true&cascade=true' % lswitch_id
     client.delete_resource(resource)

vmware_nsx/nsxlib/v3/resources.py

@@ -261,6 +261,9 @@ class LogicalPort(AbstractRESTResource):
             attachment=attachment))
         return self._client.create(body=body)
 
+    @utils.retry_upon_exception_nsxv3(
+        nsx_exc.StaleRevision,
+        max_attempts=cfg.CONF.nsx_v3.retries)
     def delete(self, lport_id):
         return self._client.url_delete('%s?detach=true' % lport_id)