glanceclient.common.utils.strip_version doesn't handle a service type in the path

In trying to workaround bug 1707995, where we have a URL like:

http://23.253.94.203/image/v2

We tried using glanceclient.common.utils.strip_version() but that doesn't work with the 'image' in the path:

>>> from glanceclient.common import utils
>>> url = 'http://23.253.94.203/image/v2'
>>> utils.strip_version(url)
('http://23.253.94.203/image/v2', None)
>>> url = 'http://23.253.94.203/v2'
>>> url_parts = urlparse.urlparse(url)
>>> url_parts
ParseResult(scheme='http', netloc='23.253.94.203', path='/v2', params='', query='', fragment='')
>>> utils.strip_version(url)
('http://23.253.94.203', 2.0)
>>>