Update handler for PORT AFTER_CREATE
Update handler for PORT AFTER_CREATE

Updated handler for PORT AFTER_CREATE events
to handle_payload_event method. Once we move over
to payloads for all callbacks the shims will be
removed.

Closes-Bug: #1931220
Change-Id: I0adaed888d8c23e0d3a79380db70e8c709324a6d

openstack/neutron,openstack/neutron,mahak/neutron,mahak/neutron,mahak/neutron,openstack/neutron