Updated openstack/openstack
Project: openstack/requirements  df444f161d085478bc32ac529062afeabcfc3faa
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Unpin keyring, just skip keyring 2.0

As per bug 1197988, keyring 2.1 has the bug fixed, so unpin keyring.

Change-Id: I9e60e134bed338781cc5a14ee8caae4bc93a538c