Agent Upgrade - PID check currently depends on English string, fails on non-English Windows

The agent upgrade wait script on Windows runs tasklist then searches for English string No tasks are running at https://github.com/puppetlabs/puppetlabs-puppet_agent/blob/master/templates/install_puppet.bat.erb#L18. This string is never found on non-English Windows, which will block the upgrade indefinitely (due to MODULES-3434), and may cause additional upgrades to be queued up on each subsequent agent run.

The solution here is to use qprocess which returns an exit code based on process id.

QProcess doesn't exist on Nano, so the solution is wmic instead.