NVP plugin extension lswitch lport cannot be updated or deleted

Nicira NVP plugin create extension lswitches when port number on a bridged (flat) network reaches upper limit (configured by max_lp_per_bridged_ls in nvp.ini). However, the ports created on extension lswitches cannot be updated or deleted.

For example, if flat network net1 has already <max_lp_per_bridged_ls> ports, and a new instance is booted on this network, NVP plugin creates an extension logical switch in NSX controller, which has an uuid different from the neutron network, and the new logical port corresponding to the neutron port will be created on this extension logical switch.

However, if run neutron port-update for this new port, it will fail:
2014-08-05 07:26:09,984 59933072 ERROR [NVPApiHelper] Server Error Message: lport 'd7df5a6e-ba8b-4a75-9c1d-11279b70d2a0' is not bound to lswitch '7607649d-c29a-4eb2-863a-606e96175185' (it is bound to lswitch 'ccbfdf47-b84c-426d-820c-18984e06d859')
2014-08-05 07:26:09,984 59933072 ERROR [neutron.plugins.nicira.nvplib] Port or Network not found, Error: An unknown exception occurred.
2014-08-05 07:26:09,985 59933072 ERROR [NeutronPlugin] Unable to update port id: d7df5a6e-ba8b-4a75-9c1d-11279b70d2a0.

Similarly, if run nova delete <vm id>, there is similar error:
2014-08-05 02:08:50,938 59933072 DEBUG [neutron.plugins.nicira.api_client.request_eventlet] [7] Completed request 'DELETE /ws.v1/lswitch/7607649d-c29a-4eb2-863a-606e96175185/lport/8eca6560-601d-49bc-896c-c6a4d7059110': 404
2014-08-05 02:08:50,938 59932752 ERROR [NVPApiHelper] Received error code: 404
2014-08-05 02:08:50,938 59932752 ERROR [NVPApiHelper] Server Error Message: lport '8eca6560-601d-49bc-896c-c6a4d7059110' is not bound to lswitch '7607649d-c29a-4eb2-863a-606e96175185' (it is bound to lswitch '720a6577-60cb-45c6-8821-f276de8cb804')
2014-08-05 02:08:50,939 59932752 ERROR [neutron.plugins.nicira.nvplib] Port or Network not found

Root cause:
The extension logical switch has different uuid, but when updating/deleting the port, the original neutron network uuid is used.

This can be fixed either in nvp plugin to save lswitch information in neutron db, or fixed in NSX controller so that if a port is found in extension lswitch, it should be updated/deleted instead of reporting error.