update python samples

Author: wing328

samples/client/petstore/python-asyncio/setup.py

@@ -32,7 +32,7 @@
     url="",
     keywords=["OpenAPI", "OpenAPI-Generator", "OpenAPI Petstore"],
     install_requires=REQUIRES,
-    packages=find_packages(),
+    packages=find_packages(exclude=["test", "tests"]),
     include_package_data=True,
     long_description="""\
     This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501

samples/client/petstore/python-tornado/setup.py

@@ -32,7 +32,7 @@
     url="",
     keywords=["OpenAPI", "OpenAPI-Generator", "OpenAPI Petstore"],
     install_requires=REQUIRES,
-    packages=find_packages(),
+    packages=find_packages(exclude=["test", "tests"]),
     include_package_data=True,
     long_description="""\
     This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501

samples/client/petstore/python/setup.py

@@ -31,7 +31,7 @@
     url="",
     keywords=["OpenAPI", "OpenAPI-Generator", "OpenAPI Petstore"],
     install_requires=REQUIRES,
-    packages=find_packages(),
+    packages=find_packages(exclude=["test", "tests"]),
     include_package_data=True,
     long_description="""\
     This spec is mainly for testing Petstore server and contains fake endpoints, models. Please do not use this for any other purpose. Special characters: \" \\  # noqa: E501