Refresh dockerfile
Refresh dockerfile

The following now works:

  docker build -t vpnkit .
  docker run -it -v $(pwd):/home/opam/src bash

and then

  make clean
  make

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@docker.com>

djs55/vpnkit,djs55/vpnkit,djs55/vpnkit