Run weave on top of early-docker just as flannel

[sheerun]

Hey,

I thought it might be a good idea to run weave on top of early-docker, just as flannel does:
https://coreos.com/flannel/docs/latest/flannel-config.html

Here's its service file from coreos:

[Unit]
Description=Network fabric for containers
Documentation=https://github.com/coreos/flannel
Requires=early-docker.service
After=etcd.service etcd2.service early-docker.service
Before=early-docker.target

[Service]
Type=notify
Restart=always
RestartSec=5
Environment="TMPDIR=/var/tmp/"
Environment="DOCKER_HOST=unix:///var/run/early-docker.sock"
Environment="FLANNEL_VER=0.5.3"
Environment="ETCD_SSL_DIR=/etc/ssl/etcd"
Environment="FLANNEL_ENV_FILE=/run/flannel/options.env"
LimitNOFILE=40000
LimitNPROC=1048576
ExecStartPre=/sbin/modprobe ip_tables
ExecStartPre=/usr/bin/mkdir -p /run/flannel
ExecStartPre=/usr/bin/mkdir -p ${ETCD_SSL_DIR}
ExecStartPre=-/usr/bin/touch ${FLANNEL_ENV_FILE}

ExecStart=/usr/libexec/sdnotify-proxy /run/flannel/sd.sock \
  /usr/bin/docker run --net=host --privileged=true --rm \
  --volume=/run/flannel:/run/flannel \
  --env=NOTIFY_SOCKET=/run/flannel/sd.sock \
  --env=AWS_ACCESS_KEY_ID=${AWS_ACCESS_KEY_ID} \
  --env=AWS_SECRET_ACCESS_KEY=${AWS_SECRET_ACCESS_KEY} \
  --env-file=${FLANNEL_ENV_FILE} \
  --volume=/usr/share/ca-certificates:/etc/ssl/certs:ro \
  --volume=${ETCD_SSL_DIR}:/etc/ssl/etcd:ro \
  quay.io/coreos/flannel:${FLANNEL_VER} /opt/bin/flanneld --ip-masq=true

# Update docker options
ExecStartPost=/usr/bin/docker run --net=host --rm -v /run:/run \
  quay.io/coreos/flannel:${FLANNEL_VER} \
  /opt/bin/mk-docker-opts.sh -d /run/flannel_docker_opts.env -i