Don't run repo cloner within VirtualBox guests
Don't run repo cloner within VirtualBox guests

Running cloner in vagrant VMs is annoying because it makes testing local
changes a pain when it shouldn't be. Only run if our provider is not virtualbox.

michaeltchapman/puppet_openstack_builder,phchoic/puppet_openstack_builder,phchoic/puppet_openstack_builder,phchoic/puppet_openstack_builder,michaeltchapman/puppet_openstack_builder,michaeltchapman/puppet_openstack_builder