issue 2667-Improve REST API URL consistency for container/containers

I really like this design using HATEOAS because it makes life easier for the developer to find links quickly.

Anyway I'd like to dive in here and patch this up. I've made a fix but doing a grep I noticed that there are a lot of references to "containers" from other classes and docs. The api is already utilizing HATEOAS could which links are missing?

git grep --files-without-match "\/containers" | grep -e "java$" |uniq | grep -ne "java$"