virDomainDeviceInfoIterateInternal: Iterate through redirdevs too
    
    This is going to be important later when we received
    DEVICE_DELETED event on the qemu monitor. If we do,
    virDomainDefFindDevice() is called to find the device for given
    device alias in the virDomainDef tree. When we enable removal for
    redirdevs we need to include them in the lookup process too.
    
    Signed-off-by: Michal Privoznik <mprivozn@redhat.com>