Update git submodules
* Update rpm-packaging-tools from branch 'master'
to 3a863b66c7653e6159f81c1cba1da6d56f02dc8a
- 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: #38550
Change-Id: Iae0078a87caee6dbcf2e451e7bb35acc02fd4253
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