ARANGO_NO_AUTH still disables auth if set to 0

[dbsanfte]

From the docs, setting ARANGO_NO_AUTH to 1 is meant to disable auth, so the corrolary of setting it to 0 not disabling auth is implied.

This is not the case however. The entrypoint checks for this variable to be defined, and disables auth regardless of its value.

If this is the desired behaviour, it should be noted in the docs that this is not a switch.

https://github.com/arangodb/arangodb-docker/blob/a2086d378d6c439d95b6900c6429709e57c6f24d/docker-entrypoint33.sh#L141