p scatter test

$ simdag/network/mxn/test_intra_scatter ${srcdir:=.}/simdag/network/mxn/platform_4p_1switch.xml --surf-path=${srcdir} --log=sd_kernel.thres=warning --log=root.fmt:[%10.6r]%e(%i:%P@%h)%e%m%n
> [  0.000000] (0:@) surf_workstation_model_init_ptask_L07
> 8