executor: Fix setting duration for rt-app wloads
executor: Fix setting duration for rt-app wloads

mdigiorgio/lisa,ARM-software/lisa,mdigiorgio/lisa,bjackman/lisa,arnoldlu/lisa,bjackman/lisa,credp/lisa,ARM-software/lisa,joelagnel/lisa,arnoldlu/lisa,ARM-software/lisa,ARM-software/lisa,credp/lisa,credp/lisa,credp/lisa,joelagnel/lisa