Open Stack

Hi all,

I'm using openstack command like this, and got error:

```
gyw at c1:~$ openstack port create --network selfservice --vnic-type
remote-managed \
> --binding-profile '{"pci_vendor_info": None, "pci_slot": None,
"physical_network": None, "card_serial_number": "AB0123XX0042",
"pf_mac_address": "08:c0:eb:8e:bd:f8", "vf_num":1, "vnic_type":
"remote-managed"}' \
> pf0vf0
Expected '<key>=<value>' or JSON data for option --binding-profile, but
encountered JSON parsing error: Expecting value: line 1 column 21 (char 20)
```

So how to set "pci_vendor_info" to NoneType of python in openstack CLI's
json format string?

BTW, "NoneType of python" means the NoneType in python code, like these
comment in
https://github.com/openstack/neutron/blob/stable/yoga/neutron/common/ovn/utils.py

```
    # With this example param_set:
    #
    # param_set = {
    #     'do_not_check_this_key': None,
    #     'pci_slot': [str],
    #     'physical_network': [str, type(None)]
    # }
    #
    # We confirm that each binding_profile key is of one of the listed
types,
    # allowing validation of polymorphic entries.
    #
    # 'physical_network' is polymorphic because:  When a
VNIC_REMOTE_MANAGED or
    # VNIC_DIRECT with PORT_CAP_SWITCHDEV capability port is attached to a
    # project network backed by an overlay (tunneled) network the value
will be
    # 'None'.  For the case of ports attached to a project network backed by
    # VLAN the value will be of type ``str``.  This comes from Nova and is
    # provided in the ``physical_network`` tag in the Nova PCI Passthrough
    # configuration.
    #
    # In the above example the type of the value behind
'do_not_check_this_key'
    # will not be checked, 'pci_slot' must be ``str``, 'physical_network
must
    # be either ``str`` or ``NoneType``.
```

Thank you~

----
Simon Jones
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