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>>    ...
>>    DockerInsecureRegistryAddress: 172.19.0.2:8787/tripleoupstream
>>    DockerKeystoneImage: 172.19.0.2:8787/tripleoupstream/centos-binary-
>> keystone:latest
>>    ...

That's strange construction, are you sure guys that you don't want to
separate address:port from namespace? (tripleoupstream here).

Say you'd like to setup docker to point to insecure registry (add
--insecure-registry do systemd conf), that will take addr:port not
whole thing.