socat friendly command

tested with simple fig
amb:
 build: /projects/docker-ambassador
 links:
  - simple
 ports:
  - 8000:8000

simple:
 image: centos
 command: python -m SimpleHTTPServer
 ports:
  - 8000

simplecli:
 image: ubuntu
 command: /bin/sh -c "curl `env | grep ADDR | cut -f2 -d'='`:8000"
 links:
   - amb:amb