Vagrant error messages are suppressed

[stephenreay]

Overview of the Issue

When an underlying vagrant issue occurs (such as a plugin issue) the error message from packer can be quite obscure.

For example, an out-of-date Vagrant VMware utility caused Packer to report:

Build 'vmware' errored after 8 seconds 844 milliseconds: error: SSH Port was not properly retrieved from SSHConfig.

Reproduction Steps

Have a config that will produce some vagrant error;

Run a packer build using the vagrant builder.

Plugin and Packer version

Packer 1.7.2

Operating system and Environment details

macOS 11.4 on Intel