Better import for python client.

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

@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+"""Add all of the modules in the current directory to __all__"""
+import os
+
+# import models into package
+{{#models}}
+{{#model}}
+from .models.{{classname}} import {{classname}}
+{{/model}}
+{{/models}}
+
+# import apis into package
+{{#apiInfo}}{{#apis}}{{#operations}}
+from .{{classname}} import {{classname}}
+{{/operations}}{{/apis}}{{/apiInfo}}
+
+# import ApiClient
+from .swagger import ApiClient
+
+__all__ = []
+
+for module in os.listdir(os.path.dirname(__file__)):
+  if module != '__init__.py' and module[-3:] == '.py':
+    __all__.append(module[:-3])