scripts: ensure not specifying subcommand shows help text

With Python 2, argparse subparsers behaviour in Python 2 was to print
the usage information if the subparsers argument wasn't specified.
However, with Python 3.2.3 and later a subparsers argument is not
required by default, leading to errors when no arguments are specified:

  AttributeError: 'Namespace' object has no attribute 'func'

Restore the previous desired behaviour of showing the help text for
devtool, recipetool and the devtool-stress script by setting
subparsers.required to True.

(From OE-Core rev: d36fdea1a7f32d97187e0e9e6d701ae8fa304e8f)

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

scripts/contrib/devtool-stress.py

@@ -213,6 +213,7 @@ def main():
     parser.add_argument('-s', '--skip', help='Skip specified recipes (comma-separated without spaces, wildcards allowed)', metavar='PNLIST')
     parser.add_argument('-c', '--skip-classes', help='Skip recipes inheriting specified classes (comma-separated) - default %(default)s', metavar='CLASSLIST', default='native,nativesdk,cross,cross-canadian,image,populate_sdk,meta,packagegroup')
     subparsers = parser.add_subparsers(title='subcommands', metavar='<subcommand>')
+    subparsers.required = True
 
     parser_modify = subparsers.add_parser('modify',
                                           help='Run "devtool modify" followed by a build with bitbake on matching recipes',

scripts/devtool

@@ -301,6 +301,7 @@ def main():
         tinfoil.shutdown()
 
     subparsers = parser.add_subparsers(dest="subparser_name", title='subcommands', metavar='<subcommand>')
+    subparsers.required = True
 
     subparsers.add_subparser_group('sdk', 'SDK maintenance', -2)
     subparsers.add_subparser_group('advanced', 'Advanced', -1)

scripts/recipetool

@@ -60,6 +60,7 @@ def main():
     parser.add_argument('-h', '--help', action='help', default=argparse.SUPPRESS,
                         help='show this help message and exit')
     subparsers = parser.add_subparsers(title='subcommands', metavar='<subcommand>')
+    subparsers.required = True
 
     if global_args.debug:
         logger.setLevel(logging.DEBUG)