unable to make_sdk using argparse

[Matthew Edmonds]

The following example taken from http://docs.openstack.org/developer/os-client-config/#constructing-openstack-sdk-object does not work, as seen here:

>>> import argparse
>>> import os_client_config
>>> sdk = os_client_config.make_sdk(options=argparse.ArgumentParser())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/os_client_config/__init__.py", line 83, in make_sdk
    cloud = get_config(options=options, **kwargs)
  File "/usr/lib/python2.7/site-packages/os_client_config/__init__.py", line 29, in get_config
    config.register_argparse_options(options, sys.argv, service_key)
AttributeError: 'OpenStackConfig' object has no attribute 'register_argparse_options'

There is an OpenStackConfig.register_argparse_arguments method, but not register_argparse_options.

This was found with os-client-config 1.21.1