* Use build-openstack-docs-pti job template for docs
* Use build-openstack-releasenotes job for release notes
(We can't use the OpenStack releasenotes template as it includes
publish jobs, stx needs its own)
* Add newnote tox environment as convenience for creating new release
notes, re-using the releasenotes venv.
* Create a release summary note.
Change-Id: I5a610cfe271707fd704248ede0db75be6d031121
Signed-off-by: Dean Troyer <dtroyer@gmail.com>