buildvm: switch buildvm's back to getting networking set on install
    
    We don't want to use linux-systems-roles here because:
    1) everytime we reinstall the mac address changes.
    2) These get all the correct netowkring from the kickstart/initial
       install
    We do want to use linux-systems-roles for bare metal machines.
    
    Signed-off-by: Kevin Fenzi <kevin@scrye.com>