Adds tests of securitySchemes in endpoints

[spacether]

Adds tests of security schemas in endpoints

• adds http + basic test in POST to http://petstore.swagger.io:80/v2/fake
• adds http + bearer test in DELETE to http://petstore.swagger.io:80/v2/fake

Improvements:

• Configuration class updated to allow access_token to be passed in init
• init variables limited to only the auth applicable ones
• removed discard_unknown_keys because it is unused in this generator

Note:

• test of apiKey already exists in GET to 'http://petstore.swagger.io:80/v2/pet/1`

PR checklist

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  ./bin/utils/export_docs_generators.sh
  

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