The docker run --dns does not resolve hostname and having hostname in resolv.conf does not work.

I plan to eventually submit pull request to have --dns put host's or link's IP address to the resolv.conf and I assume we could add resolution of hostnames in --dns options as well. But for now, using ```docker run --dns=dns.dev.org``` would likely lead to broken setup because glibc calls inet_aton directly so it can't possibly work with FQDN.