Only log warning when cleaning up disks
Only log warning when cleaning up disks

If a disk exists but isn't attached to a guest, don't attempt to remove
disk from guest.

marxarelli/vagrant,sni/vagrant,chrisroberts/vagrant,chrisroberts/vagrant,sni/vagrant,sni/vagrant,chrisroberts/vagrant,marxarelli/vagrant,marxarelli/vagrant,mitchellh/vagrant,mitchellh/vagrant,mitchellh/vagrant,marxarelli/vagrant,mitchellh/vagrant,sni/vagrant,chrisroberts/vagrant