when sharing a /var/lib/docker dir with more than one distribution, an existing lxc-start-unconfined softlink may point to a non-existant path, following that link (as Stat does) will cause the daemon to fail to start
Allow untag operations with no container validation
Merge pull request #3217 from SvenDowideit/deal-with-changing-paths-for-lxc-start

lxc-start-unconfined softlink can go bad
Merge pull request #3230 from crosbymichael/allow-untag

Allow untag operations with no container validation