fix winreg usage for python2 on windows (#1316)

Author: asottile

docs/changelog/1315.bugfix.rst

@@ -0,0 +1 @@
+Fix import and usage of ``winreg`` for python2.7 on windows - by :user:`asottile`.

src/tox/interpreters/windows/pep514.py

@@ -5,7 +5,7 @@
 import re
 
 import six
-import winreg
+from six.moves import winreg
 
 from tox import reporter
 from tox.interpreters.py_spec import PythonSpec
@@ -52,7 +52,7 @@ def discover_pythons():
 
 def process_set(hive, hive_name, key, flags, default_arch):
     try:
-        with winreg.OpenKeyEx(hive, key, access=winreg.KEY_READ | flags) as root_key:
+        with winreg.OpenKeyEx(hive, key, 0, winreg.KEY_READ | flags) as root_key:
             for company in enum_keys(root_key):
                 if company == "PyLauncher":  # reserved
                     continue

tox.ini

@@ -139,7 +139,7 @@ include_trailing_comma = True
 force_grid_wrap = 0
 line_length = 99
 known_first_party = tox,tests
-known_third_party = apiclient,docutils,filelock,flaky,freezegun,git,httplib2,oauth2client,packaging,pathlib2,pkg_resources,pluggy,py,pytest,setuptools,six,sphinx,toml,winreg
+known_third_party = apiclient,docutils,filelock,flaky,freezegun,git,httplib2,oauth2client,packaging,pathlib2,pkg_resources,pluggy,py,pytest,setuptools,six,sphinx,toml
 
 [testenv:release]
 description = do a release, required posarg of the version number