Added new role for building the Docker images from scratch.

README.md

build_images.yml

buildca.yml

buildimages.yml

group_vars/all/main.yml

roles/build/defaults/main.yml

roles/build/handlers/main.yml

roles/build/meta/main.yml

roles/build/tasks/centos.yml

roles/build/tasks/main.yml

roles/build/tasks/nginx.yml

roles/build/tasks/nifi.yml

roles/build/tasks/openjdk.yml

roles/build/tasks/zookeeper.yml

...ld/templates/etcroot/etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-7

roles/build/templates/etcroot/etc/sysconfig/network

roles/build/templates/etcroot/etc/yum.conf

.../build/templates/etcroot/etc/yum.repos.d/CentOS-Base.repo

roles/build/templates/etcroot/etc/yum.repos.d/CentOS-CR.repo

...d/templates/etcroot/etc/yum.repos.d/CentOS-Debuginfo.repo