c3ef6d0 full fix for XSA-226, replacing workaround

Authored and Committed by myoung 6 years ago
    full fix for XSA-226, replacing workaround
    drop conflict of xendomain and libvirtd as can cause problems (#1398590)
    add-to-physmap error paths fail to release lock on ARM [XSA-235] (#1484476)
    Qemu: audio: host memory leakage via capture buffer [CVE-2017-8309] (#1446521)
    Qemu: input: host memory leakage via keyboard events [CVE-2017-8379] (#1446561)
    
        
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