Doubled references for schemas combined with oneOf, anyOf, allOf

[grasslasts]

When combining schema that was previously added to components with oneOf, anyOf, allOf it get referenced with doubled reference.

Example:

from apispec import APISpec
from apispec.utils import OpenAPIVersion


spec = APISpec('test', 'v1', OpenAPIVersion('2.0'))
spec.components.schema(
    'Request', 
    {
        'properties': {
            'bool_field': {
                'type': 'boolean'
            },
            'id': {
                'type': 'integer'
            },
            'name': {
                'type': 'string',
                'description': 'name'
            },
            'list_field': {
                'type': 'array',
                'items': {
                    'type': 'integer'
                }
            }
        }
    }
)
operations = {
    'responses': {},
    'parameters': [
        {
            'in': 'body',
            'required': False,
            'name': 'body',
            'schema': {
                'allOf': [
                    '#/definitions/Request'
                ],
                'example': {
                    'id': 1,
                    'name': 'test',
                    'bool_field': True,
                    'list_field': [
                        1, 2, 3
                    ]
                }
            }
        }
    ]
}
spec.path(path='test', operations={'post': operations})
print(spec.to_dict())

Output:
{'paths': OrderedDict([('test', {'post': {'responses': OrderedDict(), 'parameters': [{'in': 'body', 'required': False, 'name': 'body', 'schema': {'allOf': [{'$ref': '#/definitions/#/definitions/Request'}], 'example': {'id': 1, 'name': 'test', 'bool_field': True, 'list_field': [1, 2, 3]}}}]}})]), 'info': {'title': 'test', 'version': 'v1'}, 'swagger': '2.0', 'definitions': {'Request': {'properties': {'bool_field': {'type': 'boolean'}, 'id': {'type': 'integer'}, 'name': {'type': 'string', 'description': 'name'}, 'list_field': {'type': 'array', 'items': {'type': 'integer'}}}}}}