libvirt: several API calls do not honour read-only connection

libvirt.c in the API in Red Hat libvirt 0.8.8 does not properly restrict operations in a read-only connection, which allows remote attackers to cause a denial of service host OS crash or possibly execute arbitrary code via a 1 virNodeDeviceDettach, 2 virNodeDeviceReset, 3 virDomainRevertToSnapsho...