add generic.virtualization Qemu

[outscale-mgo]

We have xen, virtualbox and vmware, so can we have qemu too please :)

Also I've generate the png using autogen, and adding this

 if [ "$pvd" = "onprem" ] || [ "$pvd" = "azure" ] || [ "$pvd" = "generic" ]; then
    echo "converting the svg to png using inkscape for provider '$pvd'"
    python -m scripts.resource svg2png "$pvd"
  fi

using this image https://qemu.weilnetz.de/icon/benoit/black_and_orange_qemu_head.svg
but I didn't push this autogen change, as the image is now generated.

[outscale-mgo]

ping :)