Updated openstack/openstack
Project: openstack/python-openstackclient  1fa1330e1d8bc9361bbe8c88490a20f9b8fddec1
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Adjust to non-deprecated names in Keyring 1.6.+

Keyring 1.1 moved the concrete backend implementations into their
own modules. As we depend on 1.6.1+, we can make use of the new
name and remove the old one without deprecation-fallback.

Change-Id: I0682b13fc9f488b3f3d9fd057f712909fcd48bc4