Libvirt and spice [2]

This is the second patch series for spice. I did a little bit research and changed some things. 1. I changed everything that Michael has written. 2. The packages python-six python-pyparsing and spice-protocol are only built dependencies for libvirt, because of this fact alone opus is still a real dependency 3. All lines in the rootfiles of python-six python-pyparsing and spice-protocol are excluded, because we do not need this files as packages I hope these second patch series is ok.

Regards Jonatan

PS.: Thanks to for Michael for the review of the first patches.