p seq task comp only, no comm

$ simdag/partask/test_comp_only_seq ${srcdir:=.}/simdag/partask/platform_2p_1sl.xml --cfg=path:${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
> 1