Add troubleshooting for missing cgroups on mint 16 #3602

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@fosiki.com> (github: SvenDowideit)
Merge pull request #3836 from SvenDowideit/mint-cgroups-lite-docs

 Add troubleshooting for missing cgroups on mint 16