fixed circular dependency issue on python generated code

Author: HugoMario

src/main/resources/handlebars/python/model.mustache

@@ -6,15 +6,11 @@ import pprint
 import re  # noqa: F401
 
 import six
-{{#imports}}{{#@first}}
-{{/@first}}
-{{import}}  # noqa: F401,E501
-{{/imports}}
 
 
 {{#models}}
 {{#model}}
-class {{classname}}({{#parent}}{{parent}}{{/parent}}{{^parent}}object{{/parent}}):
+class {{classname}}(object):
     """NOTE: This class is auto generated by the swagger code generator program.
 
     Do not edit the class manually.

src/main/resources/mustache/python/model.mustache

@@ -6,15 +6,11 @@ import pprint
 import re  # noqa: F401
 
 import six
-{{#imports}}{{#-first}}
-{{/-first}}
-{{import}}  # noqa: F401,E501
-{{/imports}}
 
 
 {{#models}}
 {{#model}}
-class {{classname}}({{#parent}}{{parent}}{{/parent}}{{^parent}}object{{/parent}}):
+class {{classname}}(object):
     """NOTE: This class is auto generated by the swagger code generator program.
 
     Do not edit the class manually.