Description of problem:
virsh currently relies on the user having obtained PolicyKit credentials
externally. In PolicyKit 0.7 there is a new 'polkit-auth' binary is suitable for
being run by command line tools to obtain credentials. If the command line tool
has an X session active it will use the graphical prompt, otherwise it'll do a
text terminal prompt. We should use this, rather than attempting to write
equivalent ourselves.

cf comment #2 on
http://berrange.com/personal/diary/2008/01/policykit-and-libvirt-integration_11

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