New implementation of /run support

    This mounts a /run tmpfs into the container, with the initial contents
    copies from the /run in the base image, unless NoRunFs is set in the
    HostConfig.

    Additionally NoRunFs is always set during a docker build, which means
    any setup of /run in a Dockerfile is saved in the image to be copied
    into the final /run tmpfs when a container is started.

    Docker-DCO-1.1-Signed-off-by: Alexander Larsson <alexl@redhat.com> (github: alexlarsson)

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)
Set container_uuid environment

If you are running with systemd as init 1 and specify the container_uuid environment
variable, systemd will create /etc/machine-id with the correct data.

Then on the host you can setup journald to watch the container.

systemd only allows 32 chars in the UUID stored in /etc/machine-id

Then we can later apply a different patch to setup journald to watch
containers from the host and log all syslog/stdout/stderr data together
int the hosts journal.

The following link explains what systemd expects to be setup.

http://www.freedesktop.org/wiki/Software/systemd/ContainerInterface/

This should replace

https://github.com/docker/docker/issues/3506

Docker-DCO-1.1-Signed-off-by: Dan Walsh <dwalsh@redhat.com> (github: rhatdan)