Release notes are aggregated from the roles into the integrated repo,
so they should be written to include the context of which role the
change was implemented, otherwise they make little sense. More info
about this is in https://docs.openstack.org/openstack-ansible/latest/contributor/code-rules.html#release-notes
Also, the changes made in I59a0e225205be43b5bfc76c4bc3381b6e9c54cfd
included some variable removals, so we should communicate it to allow
operators to remove any related overrides.
Change-Id: Ie8d41ad00ede510324e13b42a11fe39bbc129b93