Description of problem: In qemu 0.12.x, the -net / vlan=... option is deprecated and upstream have even threatened to remove this option. We should change libguestfs to detect this and use -netdev instead. Version-Release number of selected component (if applicable): libguestfs 1.3.21
Fixed upstream as a side-effect of: http://git.annexia.org/?p=libguestfs.git;a=commitdiff;h=866ec00d1f8bc40042795b66ceec12608bb1f9e8 and http://git.annexia.org/?p=libguestfs.git;a=commitdiff;h=4963be850090933e5769f9d3412d9eb86f522b1b