[Container-tools] ADB - Removing docker-registry from ks files

[Tomáš Nožička]

Hi,

In CentOS there are 2 rpms:
  1) docker-registry-0.9.1-7.el7.x86_64 - the old and **deprecated**
version of Docker Registry which we have **pre-installed in ADB**
  
  2) docker-distribution-2.1.1-3.el7.x86_64 - not pre-installed in ADB

The docker-registry rpm is only installed in ADB boxes but it is not
started or configured in Vagrant files. 

The Docker Registry can be run as a docker container or AtomicApp [2]
therefore none of the rpms might be needed. Also in openshift ADB we
are exposing the internal registry so there is no need for additional
one.

I think we should remove the deprecated docker-registry rpm from
kickstart files. Plese reply to achieve some form of consensus.
This issue is tracked in [1].

[1] - Docker registry (distribution) in ADB https://github.com/projecta
tomic/adb-atomic-developer-bundle/issues/274
[2] - [WIP] Add Docker Registry v2 AtomicApp https://github.com/project
atomic/nulecule-library/pull/71


- Tomas Nozicka