remove response "validation"

It seems somebody wanted to implement response
validation, but now it's completely broken: it's done in
checked_data method, which takes data either from web input
or from data keyword, and second, there is only one
validate_response method which it empty.

So let's remove it now and if somebody will have spare
time in the future, he could implement it from scratch.

Change-Id: Ic60236fce11998d76354d3d2707d0260351ca063

nailgun/nailgun/api/v1/handlers/base.py

@@ -279,7 +279,6 @@ def content_json(func, cls, *args, **kwargs):
     )
 
     request_validate_needed = True
-    response_validate_needed = True
 
     resource_type = "single"
     if issubclass(
@@ -337,16 +336,6 @@ def content_json(func, cls, *args, **kwargs):
         web.header('Content-Type', 'text/plain')
         raise http_error
 
-    if all([
-        settings.DEVELOPMENT,
-        response_validate_needed,
-        getattr(cls.__class__, 'validator', None) is not None
-    ]):
-        BaseHandler.checked_data(
-            cls.validator.validate_response,
-            resource_type=resource_type
-        )
-
     web.header('Content-Type', 'application/json', unique=True)
     return json_resp(resp)
 

nailgun/nailgun/api/v1/validators/base.py

@@ -75,12 +75,6 @@ class BasicValidator(object):
                 )
             raise errors.JsonValidationError(exc.message)
 
-    @classmethod
-    def validate_response(cls, resp, resource_type,
-                          single_schema=None,
-                          collection_schema=None):
-        pass
-
     @classmethod
     def validate(cls, data):
         return cls.validate_json(data)