WinRM test for long-running command.

pywinrm accepted my pull request (https://github.com/diyan/pywinrm/pull/25) to fix the issue when commands take longer than 60 seconds (https://github.com/ansible/ansible/issues/8206).  I've added a test to verify it works (when using the latest pywinrm).

https://github.com/ansible/ansible/issues/8206 should be fixed if users update to the latest pywinrm (`pip install -U http://github.com/diyan/pywinrm/archive/master.zip#egg=pywinrm`).