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This adds and allows Ubuntu 18.04 to be used as KVM host. In addition, on the UI when hypervisor version key is missing, this adds and display the host os and version detail which is useful to show the KVM host os and version. When cache mode 'none' is used for empty cdrom drives, systemvms and guest VMs fail to start on newer libvirtd such as Ubuntu bionic. The fix is ensure that cachemode is not declared when drives are empty upon starting of the VM. Similar issue logged at redhat here: https://bugzilla.redhat.com/show_bug.cgi?id=1342999 The workaround is to ensure that we don't configure cachemode for cdrom devices at all. This also fixes live VM migration issue. Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>