Update git submodules
* Update release-test from branch 'master'
to 7d81aaa93fd31dfba0a78ba4e439b16a24b966c2
- Merge "[community goal] Update contributor documentation"
- [community goal] Update contributor documentation
This patch updates/adds the contributor documentation to follow
the guidelines of the Ussuri cycle community goal[1].
[1] https://governance.openstack.org/tc/goals/selected/ussuri/project-ptl-and-contrib-docs.html
Story: #2007236
Task: #38556
Change-Id: If778906d544e43c852ee9dadca7c7f8aba18f31e
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