swagger_spec_validator adds in x-scope property to definitions

[wasbazi]

When validating the swagger document the dictionary that is passed to swagger_spec_validator.validator20 is modified. It is possible for that library to add in any properties it wants to the spec.

Expected behavior, validation doesn't add in extra properties like x-scope to references.

Actual behavior, validation adds in extra properties like x-scope to references which can cause issues when using swagger clients that rely on the swagger_spec validator (like bravado). If the validator sets x-scope to the empty string then the bravado client can't properly understand where those references point to.

This was in a new connexion project, the swagger document had parameters defined as references.

Additional info:

Output of the commands:

• python --version
Python 3.5.1
• pip show connexion | grep "^Version\:"
Version: 1.0.89

This is related to this issue though allowing only a copy of the spec to be passed into the validator is a good idea on this side as well. Yelp/swagger_spec_validator#48