vmm/kvm: Support autodetection of host CD-ROM drive
vmm/kvm: Support autodetection of host CD-ROM drive

- If "-cdrom auto" is specified in kvm.cfg and we have read and write
access to a host CD-ROM drive, bind that drive into the VM

- Include "-cdrom auto" in newly-generated kvm.cfg files

cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr,cmusatyalab/openisr