Port pulp-manifest tool from pulp 2 to pulp 3
Upstream and downstream folks find the tool quite useful. We should have pulp-manifest available in pulp 3 repositories:
- to make it clear that it works with pulp 3 as well (it looks like it should work as is)
- to have a more logical place for it (currently it's in pulp_rpm in pulp2 branches)
- to make it easier for katello to package it
It can be in a dedicated repository or a part of pulp_file repo.
Current location: https://github.com/pulp/pulp_rpm/tree/2.21-release/pulp_manifest