Baseline changes to comply with Release Notes Management
based in Reno [0]:
* 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.
* Adding SPDX-License-Identifier: Apache-2.0
[0] https://docs.openstack.org/reno/latest/
Story: 2003101
Task: 26696
Change-Id: I03cd9d9fe6e2d0d4ae1a02210f74a456a2a2839c
Signed-off-by: Abraham Arce <abraham.arce.moreno@intel.com>
92e1b2e3bf