Add couple missing options, and make the completion overall work better.
That said completion is still incomplete, pardon the pun. After user has
specified policy then giving a hint what priority needs to be specified is
theoretically possible, but such hint is not given. There does not seem to
be easy way to know when user wants stops specifying options and move to
defining priority in: chrt [options] [prio] [command|pid].
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
Users who know the short options can just hit the short option instead
of tab, and it's not likely that it would be helpful to present a list
of single character options to users who don't know them, doing so
just unnecessarily trashes the list of suggestions.
Signed-off-by: Ville Skyttä <ville.skytta@iki.fi>