I've installed the latest version of vagrant (1.6.1) and followed the manual. Unfortunately the commands 'list-roles' and 'enable-role' did not show up when calling 'vagrant list-commands'.
The commands could not be executed either.
After downgrading to Vagrant 1.5.4 it worked. Maybe something has changed in the Vagrantfile synatx.
Version: unspecified
Severity: normal
Platform: PC
URL: https://github.com/mitchellh/vagrant/issues/3775