As an example, `recipetool create foo bar baz` shows `recipetool: error:
unrecognized arguments: bar baz` and then displays the main help, not the help
for the create command. Fix by saving the subparser name and using it in
parse_args() to look up the subparser.
(From OE-Core rev: 7fdaaedf4c63c8d019f03f84e22f9b838ef19aa6)
Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>