* fn: cleanup of docker private registry code
Start using URL parsed ServerAddress and its subdomains
for easier image ensure/pull in docker driver. Previous
code to lookup substrings was faulty without proper
URL parse and hostname tokenization. When searching
for a registry config, if image name does not contain
a registry and if there's a private registry configured,
then search for hub.docker.com and index.docker.io. This
is similar to previous code but with correct subdomain
matching.
* fn-dataplane: take port into account in auth configs
