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The schema of string integer didn't handle the case of empty string

https://github.com/openstack/nova/blob/master/nova/api/validation/parameter_types.py#L186

positive_integer = {
    'type': ['integer', 'string'],
    'pattern': '^[0-9]*$', 'minimum': 1
}


non_negative_integer = {
    'type': ['integer', 'string'],
    'pattern': '^[0-9]*$', 'minimum': 0
}


There is no limit on the length of string. So the user can input a empty string. When I input empty string, the nova api return 500.

The affected APIs are:
1. create_backup
2. server create with multiple create
3. networks
4. tenant_networks

** Affects: nova
     Importance: Undecided
         Status: New

-- 
The JSON-Schema of string integer can't handle the case of empty string
https://bugs.launchpad.net/bugs/1652719
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