openstack nuage switchport mapping uses user port name instead of physical port name

[jbemmel]

The 'port-id' parameter in openstack nuage switchport mapping create must be set to the user defined name of the port, instead of the immutable physical port name which appears in LLDP messages

See e.g.

nuage-openstack-neutron/nuage_neutron/plugins/common/service_plugins/net_topology/plugin.py

Line 47 in e356c01

'name': [switchport_mapping['port_id']]}

and

nuage-openstack-neutron/nuage_neutron/plugins/sriov/mech_nuage.py

Line 284 in e356c01

'name': port.get('name'),

This blocks users from renaming ports, as the topology discovery will no longer work