2.6 changelog gen/version/root dir cleanup (#40421)

* patched in changelog gen stuff from stable-2.5
* Makefile updates
* release.py as single-source-of-truth
* Remove obsolete ansible-core-sitemap.xml file.
* Move ROADMAP.rst into README.rst.
* dynamic rpm changelog, zap old deb/rpm changelogs
* fix changelog in MANIFEST.in
* Remove obsolete hacking/update.sh script.
* Remove ref to deleted authors script.
* Remove ref to removed module-formatter script.
* Update headings to match script names.
* MANIFEST.in cleanup
* removed RELEASES.txt and versions.yml
* removed obsolete release generation playbook/bits (not used since 2.5)
* misc Makefile cleanup
* speculative changes to DEB versioning
* allow override of DEB_VERSION/DEB_RELEASE

hacking/ticket_stubs/bug_misunderstanding.md

@@ -0,0 +1,27 @@
+Possible Misunderstanding
+=========================
+
+Hi!
+
+Thanks very much for your submission to Ansible.  It sincerely means a lot to us.
+
+We believe the ticket you have filed is being somewhat misunderstood, as one thing works a little differently than stated.
+
+In particular, we believe you have said:
+
+   * THING ONE
+
+However, however what is happening is that:
+
+   * THING TWO
+
+We would suggest:
+
+   * THING THREE
+
+In the future, this might be a topic more well suited for the user list, which you can also post here if you'd like some more help with the above.
+   
+   * https://groups.google.com/forum/#!forum/ansible-project
+
+Thank you once again for this and your interest in Ansible!
+