Write OONI Pipeline init script

Currently when the machine hosting the pipeline reboots the docker container services need to be rested manually.

This is a summary of them:

root@IX-0150:~# docker ps
CONTAINER ID        IMAGE                       COMMAND               CREATED             STATUS              PORTS                                     NAMES
f117c1ea99b0        ooni/sshd:latest            "/usr/sbin/sshd -D"   2 weeks ago         Up 2 weeks          127.0.0.1:49154->22/tcp                   sshd
fc50af5348e5        ooni-app:latest             "grunt"               6 weeks ago         Up 2 weeks          35729/tcp, 104.193.9.122:3000->3000/tcp   romantic_hypatia
48b5ce0241e8        ooni/web-server:latest      "nginx"               7 weeks ago         Up 2 weeks          104.193.9.122:80->80/tcp                  web-server
a87fac01ec4d        dockerfile/mongodb:latest   "mongod"              7 weeks ago         Up 2 weeks          28017/tcp, 127.0.0.1:49153->27017/tcp     mongodb

This task is to implement init scripts for either all the pipeline or the individual services