Updated openstack/openstack
Project: openstack/keystone  15916152d82684a4d46359ddad4bc8185c7cfbc6
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Ensure mapping rule has only local and remote properties

As per the API spec, a mapping rule reference should only have a
local and remote properties.
This change ensures that the schema used to validate mappings
fulfills that requirement.

bp mapping-distributed-admin

Change-Id: I00468c56d9b6689789b2123c3797c56cc73517d1