Adds libvirt as supported provider in Vagrantfile template
Adds libvirt as supported provider in Vagrantfile template

cimarron-pistoncloud/molecule,metacloud/molecule,rgreinho/molecule,j0lly/molecule,kireledan/molecule,metacloud/molecule,retr0h/molecule,cimarron-pistoncloud/molecule,rjfellman/molecule,rjfellman/molecule,retr0h/maquina,metacloud/molecule,rgreinho/molecule,kharkevich/molecule,rjfellman/molecule,j0lly/molecule,cimarron-pistoncloud/molecule,j0lly/molecule,rgreinho/molecule