Updated openstack/openstack
Project: openstack/ceilometer  fe61ea9aa58cde0539b19d755ac816209ebf095f

Synchronize Python 3 requirements

We missed a few requirements in Python 3, which breaks installing
Ceilometer in Python 3 environment and therefore breaks Gnocchi.

Change-Id: I0fa6f5cad00eb3d5a645216bd96b4bba55417f88