scripts: print usage in argparse-using scripts when a command-line error occurs

For scripts that use Python's standard argparse module to parse
command-line arguments, create a subclass which will show the usage
the usage information when a command-line parsing error occurs. The most
common case would be when the script is run with no arguments; at least
then the user immediately gets to see what arguments they might need to
pass instead of just an error message.

(From OE-Core rev: d62fe7c9bc2df6a4464440a3cae0539074bf99aa)

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/recipetool

@@ -27,6 +27,7 @@ scripts_path = os.path.dirname(os.path.realpath(__file__))
 lib_path = scripts_path + '/lib'
 sys.path = sys.path + [lib_path]
 import scriptutils
+import argparse_oe
 logger = scriptutils.logger_create('recipetool')
 
 plugins = []
@@ -45,9 +46,9 @@ def main():
         logger.error("This script can only be run after initialising the build environment (e.g. by using oe-init-build-env)")
         sys.exit(1)
 
-    parser = argparse.ArgumentParser(description="OpenEmbedded recipe tool",
-                                     add_help=False,
-                                     epilog="Use %(prog)s <subcommand> --help to get help on a specific command")
+    parser = argparse_oe.ArgumentParser(description="OpenEmbedded recipe tool",
+                                        add_help=False,
+                                        epilog="Use %(prog)s <subcommand> --help to get help on a specific command")
     parser.add_argument('-d', '--debug', help='Enable debug output', action='store_true')
     parser.add_argument('-q', '--quiet', help='Print only errors', action='store_true')
     parser.add_argument('--color', choices=['auto', 'always', 'never'], default='auto', help='Colorize output (where %(metavar)s is %(choices)s)', metavar='COLOR')