Two changes

  1. Modify the network attribute in create-guest-qcow2.bash
     to point to libvirt's default - virbr0.
  2. Add an example to create F19 oz image.
Commit the first change in previous commit

Forgot to commit the below change from
6f5c1c64d3832a9ae7cf25afa9ef50760c9a36cb

 1. Modify the network attribute in create-guest-qcow2.bash
    to point to libvirt's default - virbr0.

Now commit for real.