Cole Robinson bad5eabd93 domain: Add metadata.libosinfo
From the libosinfo discussion here:
https://www.redhat.com/archives/libosinfo/2018-September/msg00003.html

This is a cross-app schema for tracking libosinfo OS ID in the
domain <metadata> XML. Example:

   <metadata>
     <libosinfo:libosinfo xmlns:libosinfo="http://libosinfo.org/xmlns/libvirt/domain/1.0">
       <libosinfo:os id="http://fedoraproject.org/fedora/17"/>
     </libosinfo:libosinfo>
   </metadata>
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