fixed circular imports on python/flask generators models

Author: HugoMario

modules/swagger-codegen/src/main/resources/flaskConnexion/model.mustache

@@ -6,8 +6,6 @@ from datetime import date, datetime  # noqa: F401
 from typing import List, Dict  # noqa: F401
 
 from {{modelPackage}}.base_model_ import Model
-{{#imports}}{{import}}  # noqa: F401,E501
-{{/imports}}
 from {{packageName}} import util
 
 
@@ -158,4 +156,4 @@ class {{classname}}(Model):
 {{/vars}}
 
 {{/model}}
-{{/models}}
+{{/models}}

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

@@ -6,11 +6,6 @@ import pprint
 import re  # noqa: F401
 
 import six
-{{#imports}}{{#-first}}
-{{/-first}}
-{{import}}  # noqa: F401,E501
-{{/imports}}
-
 
 {{#models}}
 {{#model}}