Description of problem:

Image-Serve undercloud local registry was created by DFG:DF team to replace docker-distribution/docker-registry on undercloud. Although it is not for production use, it is widely used for dev/CI/QE purposes.

AFAIK it is also used for some production cases involving ad-hoc patching of overcloud container images.

Image-Serve registry has multi-process optimizations that reduce bandwidth and time that it takes for uploading container images from undercloud to its managed overcloud(s). This may be useful for EDGE DCN and large scale production cases. 

Image-Serve should be productized for OSP (DCN at least) to replace the docker-distribution option that is still supported according to the documentation [0] but technically can no longer be maintained by RH as of OSP16.x.

Since DFG:DF team has no capacity for owning the productization of Image-Serve, it is proposed for DFG:EDGE to take ownership over Image-Serve registry in tripleo-common.

It is already packaged and released as a part of openstack-tripleo-common so nothing is needed to be done for that regard. Just maintaining it, including future RFEs, fixes, and documentation updates.

[0] https://access.redhat.com/documentation/en-us/red_hat_openstack_platform/13/html/director_installation_and_usage/configuring-a-container-image-source

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