Validation failure with relative references to another files

[javier-sierra-sngular]

When an OpenAPI document contains a relative schema reference pointing to another file, causes validate() function failure.

This is a simple schema example to reproduce:

openapi: '3.0.0'
info:
  version: 1.0.0
  title: OpenAPI simple test.
  license:
    name: MPL-2.0

paths:
  /:
    get:
      summary: test
      description: test
      operationId: test
      responses:
        '200':
          description: test
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: './components/schemas/test.yml'

The problem starts in the constructor when LocalSchemaLoader is executed. This class uses js-yaml that loads the yaml and convert it to a JSON, but it does not resolve the internal references.
So when SwaggerParser.validate try to do a dereference cannot find the files, because the relative paths are being resolved with the path of the execution program and not the path of the principal yaml file parsed partially in the constructor.

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