Some of the admin guide pages were prefixed with "identity-" because
they came from the centralized install guide or operators guide or
security guide or somewhere else. We don't need the prefix, everything
in keystone is identity. Remove the prefix from the affected pages so
that everything is consistent.
Change-Id: Icd172a39fe720472f1fb15395178f90282696ac9
This is part of an effort to consolidate everything from the Operator
guide into the Administrator guide.
Change-Id: I76b0eaee11f5a8d68304a163381c905611edd43b