Fix pylint R1714 (consider-using-in) refactor messages

Instead of checking variables are equal to one of many
values, use a tuple and check if the variable is 'in' it.
This is faster and less verbose.

Change-Id: I429dbbd92a78fdfae3140cae8a397ff10f6d956e

.pylintrc

@@ -89,7 +89,6 @@ disable=
 # new for python3 version of pylint
  chained-comparison,
  consider-using-dict-comprehension,
- consider-using-in,
  consider-using-set-comprehension,
  unnecessary-pass,
  useless-object-inheritance

neutron/cmd/pd_notify.py

@@ -31,7 +31,7 @@ def main():
     agent_pid = sys.argv[3]
     prefix = os.getenv('PREFIX1', "::")
 
-    if operation == "add" or operation == "update":
+    if operation in ["add", "update"]:
         file_utils.replace_file(prefix_fname, "%s/64" % prefix)
     elif operation == "delete":
         file_utils.replace_file(prefix_fname, "::/64")

neutron/objects/port_forwarding.py

@@ -76,7 +76,7 @@ class PortForwarding(base.NeutronDbObject):
         return True
 
     def obj_load_attr(self, attrname):
-        if attrname == 'floating_ip_address' or attrname == 'router_id':
+        if attrname in ['floating_ip_address', 'router_id']:
             return self._load_attr_from_fip(attrname)
         super(PortForwarding, self).obj_load_attr(attrname)
 

neutron/plugins/ml2/plugin.py

@@ -2054,10 +2054,9 @@ class Ml2Plugin(db_base_plugin_v2.NeutronDbPluginV2,
         mech_context = driver_context.NetworkContext(
             self, context, network_with_segments,
             original_network=network_with_segments)
-        if (event == events.PRECOMMIT_CREATE or
-                event == events.PRECOMMIT_DELETE):
+        if event in [events.PRECOMMIT_CREATE, events.PRECOMMIT_DELETE]:
             self.mechanism_manager.update_network_precommit(mech_context)
-        elif event == events.AFTER_CREATE or event == events.AFTER_DELETE:
+        elif event in [events.AFTER_CREATE, events.AFTER_DELETE]:
             self.mechanism_manager.update_network_postcommit(mech_context)
 
     @staticmethod