Fixed unicode error and supported allow_nonstandard_methods in tornado based python client (#7560)

* fixing "decoding Unicode is not supported" error for py2 when data is unicode

* allowing nonstandard methods for tornado python client.

* Making sure to return unicode when needed

modules/swagger-codegen/src/main/resources/python/api_client.mustache

@@ -547,7 +547,7 @@ class ApiClient(object):
         try:
             return klass(data)
         except UnicodeEncodeError:
-            return six.u(data)
+            return six.text_type(data)
         except TypeError:
             return data
 

modules/swagger-codegen/src/main/resources/python/tornado/rest.mustache

@@ -83,7 +83,7 @@ class RESTClientObject(object):
                 "body parameter cannot be used with post_params parameter."
             )
 
-        request = httpclient.HTTPRequest(url)
+        request = httpclient.HTTPRequest(url, allow_nonstandard_methods=True)
         request.ca_certs = self.ca_certs
         request.client_key = self.client_key
         request.client_cert = self.client_cert

samples/client/petstore-security-test/python/petstore_api/api_client.py

@@ -541,7 +541,7 @@ class ApiClient(object):
         try:
             return klass(data)
         except UnicodeEncodeError:
-            return six.u(data)
+            return six.text_type(data)
         except TypeError:
             return data
 

samples/client/petstore/python-asyncio/petstore_api/api_client.py

@@ -541,7 +541,7 @@ class ApiClient(object):
         try:
             return klass(data)
         except UnicodeEncodeError:
-            return six.u(data)
+            return six.text_type(data)
         except TypeError:
             return data
 

samples/client/petstore/python-tornado/petstore_api/api_client.py

@@ -543,7 +543,7 @@ class ApiClient(object):
         try:
             return klass(data)
         except UnicodeEncodeError:
-            return six.u(data)
+            return six.text_type(data)
         except TypeError:
             return data
 

samples/client/petstore/python/petstore_api/api_client.py

@@ -541,7 +541,7 @@ class ApiClient(object):
         try:
             return klass(data)
         except UnicodeEncodeError:
-            return six.u(data)
+            return six.text_type(data)
         except TypeError:
             return data