The quote that SandB0x posted (it comes from vagrantup.com) says that it can be used for defining "the software that needs to be installed". So is the distinction Vagrant : h/w + s/w, Salt et al : s/w?
It's more that you use configuration management for the software, and then Vagrant does the hardware and hands control over to your configuration management for the software. Vagrant can also do the software itself, yes, but the way of doing so is running shell scripts, so it's far preferable to use a configuration management tool (the main benefit being idempotence).
