Packer 0.12.1 doesn't work with VirtualBox 5.1.12 (WinRM issue)

[kagarlickij]

• Packer version: 0.12.1
• Host platform: macOS 10.12.2
• Debug log output: https://gist.github.com/kagarlickijd/a24cd51e49fa5471c742240861118b1d
• The simplest example template and scripts needed to reproduce the bug: https://github.com/kagarlickijd/packer-demo/tree/win-shutdown

[rickard-von-essen]

Thanks for reporting this. This duplicates #4321 and has been fixed on master and will be in the next release.