Hi,

I spun up a fresh centos-7.5 VM on Digital ocean and tried to do oc cluster up which require to have insecure registry `172.30.0.0/16` when I am trying to add this in the /etc/containers/registry.conf this is not picked up by docker daemon even after restart:(

I can see we have `/run/containers/registries.conf` as env file in the `/usr/lib/systemd/system/docker.service` which even not present on the system :(

Not sure where we messed up or I made some mistake here.

``` # rpm -qa | grep docker docker-common-1.13.1-63.git94f4240.el7.centos.x86_64 docker-1.13.1-63.git94f4240.el7.centos.x86_64 docker-client-1.13.1-63.git94f4240.el7.centos.x86_64 ```

Note: Same addition of insecure registry working as expected in the fedora28.