Force Swift CLI to provide region info or interrupt the request

[Hugo Kou]

Not sure about if this should be a bug or new feature

In python-keystoneclient 1.7.0+ , it mentioned

```
/app/python3/3.4.3/lib/python3.4/site-packages/keystoneclient/service_catalog.py:196: UserWarning: Providing attr without filter_value to get_urls() is deprecated as of the 1.7.0 release and may be removed in the 2.0.0 release. Either both should be provided or neither should be provided.

'Providing attr without filter_value to get_urls() is '
```

https://github.com/openstack/python-keystoneclient/commit/0d293eaf4413f82f55e3b13062b2bc710a6f3935

```
- # TODO(jamielennox): at least swiftclient is known to set attr and not
- # filter_value and expects that to mean that filtering is ignored, so
- # we can't check for the presence of attr. This behaviour should be
- # deprecated and an appropriate warning provided.
+ if attr and not filter_value:
+ warnings.warn(
+ 'Providing attr without filter_value to get_urls() is '
+ 'deprecated as of the 1.7.0 release and may be removed in the '
+ '2.0.0 release. Either both should be provided or neither '
+ 'should be provided.')
+
```

python-swiftclient should force user to provide region name if python-keystoneclient is 1.7.0+

[Hugo Kou (tonytkdk)]

1. To interrupt the request if auth version > 2.0 and force user to provide region name in the request
2. To allow the request but shows up a more clear reason about why
3. To give a default region name

[OpenStack Infra (hudson-openstack)]

Change abandoned by renminmin (<email address hidden>) on branch: master
Review: https://review.openstack.org/259887

[OpenStack Infra (hudson-openstack)]

Change abandoned by renminmin (<email address hidden>) on branch: master
Review: https://review.openstack.org/259879

[Tim Burke (1-tim-z)]

Fixed in https://review.openstack.org/#/c/246040/

[Hugo Kou (tonytkdk)]

Tim Burke fixed it
https://review.openstack.org/#/c/246040/