add six to testserver setup.py (Azure#20456)

* add six to testserver setup.py

* add mindep for six

* add additional args for pypy in testserver

Author: iscai-msft

sdk/core/azure-core/tests/conftest.py

@@ -29,6 +29,7 @@
 import os
 import subprocess
 import random
+import platform
 from six.moves import urllib
 from rest_client import TestRestClient
 import sys
@@ -71,6 +72,11 @@ def start_testserver():
     port = get_port()
     os.environ["FLASK_APP"] = "coretestserver"
     os.environ["FLASK_PORT"] = str(port)
+    if platform.python_implementation() == 'PyPy':
+        # pypy is now getting mad at us for some of our encoding / text, so need
+        # to set these additional env vars for pypy
+        os.environ["LC_ALL"] = "C.UTF-8"
+        os.environ["LANG"] = "C.UTF-8"
     cmd = "flask run -p {}".format(port)
     if os.name == 'nt': #On windows, subprocess creation works without being in the shell
         child_process = subprocess.Popen(cmd, env=dict(os.environ))

sdk/core/azure-core/tests/testserver_tests/coretestserver/setup.py

@@ -30,6 +30,7 @@
     ],
     packages=find_packages(),
     install_requires=[
-        "flask"
+        "flask",
+        "six>=1.11.0",
     ]
 )