Use Python to compute release notes version
Use Python to compute release notes version

Leave the version fields blank, since the release notes document
applies to all versions.
That will avoid manual changes in the future like we did until now.

Change-Id: I808b7d407fee9a53644879c8bc546a2e7573785e

knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui,knowncitizen/tripleo-ui