Description of problem:
fail to add ovs-bridge when vlan-mode is presented in yaml

Version-Release number of selected component (if applicable):
nmstate-0.0.7-1.el8.noarch

How reproducible:
Always

Steps to Reproduce:
add ovs with following yaml:
---
interfaces:
  - name: ovs1
    type: ovs-interface
    state: up
    ipv4:
      enabled: true
      address:
        - ip: 192.0.3.1
          prefix-length: 24
  - name: ovs0
    type: ovs-interface
    state: up
    ipv4:
      enabled: true
      address:
        - ip: 192.0.2.1
          prefix-length: 24
    mac-address: 32:e2:7b:45:f8:98
    mtu: 1400
  - name: ovs-br0
    type: ovs-bridge
    state: up
    bridge:
      options:
        fail-mode: ''
        mcast-snooping-enable: false
        rstp: false
        stp: true
      port:
        - name: ovs0
          type: internal
          vlan-mode: access
          access-tag: 2
        - name: ovs1
          type: internal

Actual results:
[root@kvm-01-guest23 ovs]# nmstatectl set ovs-vlan-mode.yaml
Traceback (most recent call last):
  File "/usr/bin/nmstatectl", line 11, in <module>
    load_entry_point('nmstate==0.0.7', 'console_scripts', 'nmstatectl')()
  File "/usr/lib/python3.6/site-packages/nmstatectl/nmstatectl.py", line 59, in main
    return args.func(args)               
  File "/usr/lib/python3.6/site-packages/nmstatectl/nmstatectl.py", line 187, in apply
    args.timeout)                        
  File "/usr/lib/python3.6/site-packages/nmstatectl/nmstatectl.py", line 206, in apply_state
    checkpoint = libnmstate.apply(state, verify_change, commit, timeout) 
  File "/usr/lib/python3.6/site-packages/libnmstate/netapplier.py", line 53, in apply
    validator.validate(desired_state)
  File "/usr/lib/python3.6/site-packages/libnmstate/validator.py", line 33, in validate
    js.validate(data, validation_schema)
  File "/usr/lib/python3.6/site-packages/jsonschema/validators.py", line 541, in validate
    cls(schema, *args, **kwargs).validate(instance)
  File "/usr/lib/python3.6/site-packages/jsonschema/validators.py", line 130, in validate
    raise error
jsonschema.exceptions.ValidationError: {'name': 'ovs-br0', 'type': 'ovs-bridge', 'state': 'up', 'bridge': {'options': {'fail-mode': '', 'mcast-snooping-enable': False, 'rstp': False, 'stp': True}, 'port':
 [{'name': 'ovs0', 'type': 'internal', 'vlan-mode': 'access', 'access-tag': 2}, {'name': 'ovs1', 'type': 'internal'}]}} is not valid under any of the given schemas
         
Failed validating 'oneOf' in schema['properties']['interfaces']['items']['allOf'][3]:
    {'oneOf': [{'$ref': '#/definitions/interface-unknown/rw'},
               {'$ref': '#/definitions/interface-ethernet/rw'},
               {'$ref': '#/definitions/interface-bond/rw'},
               {'$ref': '#/definitions/interface-linux-bridge/rw'},
               {'$ref': '#/definitions/interface-ovs-bridge/all'},
               {'$ref': '#/definitions/interface-ovs-interface/rw'},
               {'$ref': '#/definitions/interface-dummy/rw'},
               {'$ref': '#/definitions/interface-vlan/rw'}]}
              
On instance['interfaces'][2]:
    {'bridge': {'options': {'fail-mode': '',
                            'mcast-snooping-enable': False,
                            'rstp': False,
                            'stp': True},
                'port': [{'access-tag': 2,
                          'name': 'ovs0',
                          'type': 'internal',
                          'vlan-mode': 'access'},
                         {'name': 'ovs1', 'type': 'internal'}]},
     'name': 'ovs-br0',             
     'state': 'up',
     'type': 'ovs-bridge'}

Expected results:
no error

Additional info: