Support for Docker deployment via Packer

[AndyJS]

The packer/build.sh script currently defaults to building an AMI for EC2 deployment.

Docker deployment via docker.json requires a seperate shell script, or modifications to the existing script, to build correctly. If deployed to a docker container, Grafana dashboard currently reports N/A metrics. Additional work required to ensure the connector operates correctly.

[brendan-mckitrick]

Have tried a build from Packer to Docker and run into the following so far:

1. Supervisor needs to be kicked into gear when a new image is first started
   service supervisor start

2. InfluxDB is having some issues which appear very similar to:
   Can't connect to influxdb - ui on localhost:8083 not available influxdata/influxdb#1164

Influx is listening on port 8090, but other ports aren't showing up in netstat.