Comment 1 for bug 1804420

I've attached a simple script to reproduce this behaviour outside of placement.

I'm struggling to find where but AFAICT the oslo.config code parsing the command line args is failing and defaulting to the default help func for the top level command parser.

# cat /etc/redhat-release
Fedora release 28 (Twenty Eight)
# python --version
Python 2.7.15
# pip freeze | grep oslo.config
oslo.config==6.7.0
# python reproduce.py cmd bar
<bound method Commands.bar of <__main__.Commands object at 0x7f50d187c110>>

# cat /etc/redhat-release
CentOS Linux release 7.5.1804 (Core)
# python --version
Python 2.7.5
# pip freeze | grep oslo.config
oslo.config==6.7.0
# python reproduce.py cmd bar
<bound method _CachedArgumentParser.print_help of _CachedArgumentParser(prog='reproduce cmd', usage=None, description=None, version=None, formatter_class=<class 'argparse.HelpFormatter'>, conflict_handler='error', add_help=True)>