Tyr load data

Add a load_data target for tyr

2 params are needed: the name of the kraken instance and the data dir.

the target will launch the whole data import process:
* data import in bdd (fusio2ed, gtfs2ed, poi2ed, ...)
* export bdd to nav file
* update the jormungandr db with the new data for the instance
* reload the krakens

the original data will be neither moved nor modified.

This target will be used mainly in Artemis (the business test framework)

example call:
```TYR_CONFIG_FILE=/srv/tyr/settings.py python /srv/tyr/manage.py load_data airport-01 /srv/ed/airport-01/data/```