TL;DR: keystoneauth1 package seems broken, so not installed, Puppet
OpenStack CI broken, because keystone can't work.
http://logs.openstack.org/07/224107/1/check/gate-puppet-ceilometer-puppet...
In case you missed the information, probably a recent commit in
https://github.com/openstack-packages/python-keystoneauth1
Thanks,
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Emilien Macchi