powertool: parse: dont skip rails as well

Show all invalid groups and rails in a single shot. it is irritating
having to fix a rail at a time in command line

Signed-off-by: Nishanth Menon <nm@ti.com>
powertool: parse: show the list of valid rails with wrong entry

in addition to the identification of bad rails, let the user know
the valid rails from config file

Signed-off-by: Nishanth Menon <nm@ti.com>