Remove duplicated parameters for keystone

Following parameters where duplicated by mistake:
nova, glance, cinder, neutron, ceilometer, swift, enabled.

Change-Id: I4587ac21a3328a34971428629185bd919cfddb2b
Closes-bug: #1263886
(cherry picked from commit 388d47bd9b58bc2259de86dfc9c23f6f3bf60583)