Add conntrack-tools and missing dependencies.
ocaml: 4.02.0 -> 4.02.1
cjdns: service tweaks, new NixOS test
Merge pull request #4902 from mstarzyk/ocaml

ocaml: 4.02.0 -> 4.02.1
Add Dockerfile, which builds docker with nix package manager
move dockerfile to subdirectory
Merge pull request #4900 from ambrop72/conntrack

Add conntrack-tools and missing dependencies.
Revert "Add conntrack-tools and missing dependencies."
Merge pull request #4903 from NixOS/revert-4900-conntrack

Revert "Add conntrack-tools and missing dependencies."
Add conntrack-tools and missing dependencies.