Updated Dockerfile for hello-swarm to use UBI images

Ravi Srinivasan

2019-05-31 d97095794f4688075d85867179a6a47bb4fd6cb7

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s/^        listen       80/        listen       8080/
s/^user  nginx;//
s%/var/opt/rh/rh-nginx18/log/nginx/error.log%stderr%
s%access_log /var/opt/rh/rh-nginx18/log/nginx/access.log main;%%