lisa_shell: Update help for lisa-test command
lisa_shell: Update help for lisa-test command

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