power: make plot_cluster_load() use {pre,post}_plot_setup()
power: make plot_cluster_load() use {pre,post}_plot_setup()

derkling/trappy,ARM-software/trappy,JaviMerino/trappy,ARM-software/trappy,ARM-software/trappy,ARM-software/trappy,JaviMerino/trappy,derkling/trappy,joelagnel/trappy,bjackman/trappy,derkling/trappy,bjackman/trappy,bjackman/trappy,bjackman/trappy,sinkap/trappy,joelagnel/trappy,sinkap/trappy,joelagnel/trappy,joelagnel/trappy,JaviMerino/trappy,sinkap/trappy,sinkap/trappy