The --xml option allows users to request raw XML edits to virt-install
or virt-xml generated XML. This gives users a bit of a workaround
incase we don't have proper support for some XML property. The --xml
option can gain more features in the future if it makes sense, like
setting XML namespaces for example.
Basic usage is like: virt-install --xml ./@foo=bar ...
Which will change the generated <domain> XML to have
<domain foo='bar' ...
virt-xml works similarly. It can only be combined with --edit currently.
This only works with xpaths rooted against the entire document.
Signed-off-by: Cole Robinson <crobinso@redhat.com>