parser.py: Show program name in usage message instead of description

[shr-project]

• Use keyword argument as https://docs.python.org/3/library/argparse.html#argparse.ArgumentParser recommends.

• Otherwise it ends on first line of usage like bellow. usage: Deploy ROS packages into OpenEmbedded Linux [-h] [--ros-distro ROS_DISTRO] --dry-run [--pr-only] [--no-branch] [--output-repository-path OUTPUT_REPOSITORY_PATH] [--only ONLY [ONLY ...]] [--pr-comment PR_COMMENT] [--upstream-repo UPSTREAM_REPO] [--upstream-branch UPSTREAM_BRANCH] [--skip-keys SKIP_KEYS [SKIP_KEYS ...]] [--tar-archive-dir TAR_ARCHIVE_DIR] optional arguments: ...

  instead of the expected: usage: superflore-gen-oe-recipes [-h] [--ros-distro ROS_DISTRO] --dry-run [--pr-only] [--no-branch] [--output-repository-path OUTPUT_REPOSITORY_PATH] [--only ONLY [ONLY ...]] [--pr-comment PR_COMMENT] [--upstream-repo UPSTREAM_REPO] [--upstream-branch UPSTREAM_BRANCH] [--skip-keys SKIP_KEYS [SKIP_KEYS ...]] [--tar-archive-dir TAR_ARCHIVE_DIR]

  Deploy ROS packages into OpenEmbedded Linux

  optional arguments: ...

Signed-off-by: Martin Jansa martin.jansa@lge.com

[shr-project]

Updated, but the last commit IMHO isn't really an improvement, maybe setting metavar to the original values for all arguments except --only and --skip-keys and 'PKG' might be better for --skip-keys as used in --only.