Merge pull request #6 from dwoz/win_pkg_flaky

Try running fsync to avoid fs caching race condition

tests/integration/modules/test_win_pkg.py

@@ -76,6 +76,7 @@ class WinPKGTest(ModuleCase):
                     reboot: False
                 '''))
             fp_.flush()
+            os.fsync(fp_.fileno())
         # now check if curl is also in cache and repo query
         pkgs.append('curl')
         for pkg in pkgs: