Adding the JSON_ToolsMixin._replace_dict_key method to the cafe.engine.models base.py package

Added method for support in JSON responses replacing dictionary keys
Removing print
Updates from Code Review
Changin method to CommonToolsMixin
Making recursion optional and by default disabled
Removing an unnecessary else
Adding recursion=True within recursive calls
Updating the new key value assignment using the dict pop method
Updating recursion with less nesting

Change-Id: I194923a8bafecf3017533ea9c1c52e94d890fd2b
Merge "Adding the JSON_ToolsMixin._replace_dict_key method to the cafe.engine.models base.py package"