Updated openstack/openstack
Project: openstack/requirements  8402887d55b32412c121aa88b9e1f2956a9ca37d
null
Update stevedore

Stevedore 0.12 comes with a new shiny map_method function that
Ceilometer would like to use.

Change-Id: If4eda8ed2e251df67ccfe9f8093d28d2ecbd740e