Add automatic ingestion.

Description

On vagrant, datas have to be available in /vagrant/orbcomm in the virtual machine. Thus they should be put at the root directory of the project on the host machine.

On Grid5000, datas are mounted from the NFS in a specific volume that is used inside the ingestion container. Datas are read from and sent to Kafka.

In both cases, AIS messages are sent to the ais kafka topic.

Configuration options

enable_ingestion controls if the ingestion process should be started

Caveats:

Activating the ingestion may not be idempotent. If the first process ends, calling it a second time will send again all the datas to Kafka

Fix #1 (closed)