VirtualBox driver should replace only last occurence of suggested VM name.
Ensure VirtualBox virtual disks are stored in the correct directory on Windows hosts
Ensure VirtualBox virtual disks are stored in the correct directory round 2
Merge pull request #4133 from keiths-osc/windows_virtualbox_vmdk_path_fix

Ensure VirtualBox virtual disks are stored in the correct directory on Windows hosts
Fixed issue 4161

Wrong varaible name was used to try and delete the existing Vagrantfile causing an error.
Merge pull request #4162 from mitchellh/fix-issue-4161

Fixed issue 4161