Add Gandi VPS Cloud as a supported provider for terraform-openstack-tor-bridge-obfs4

Current home: https://gitlab.com/sr2c/terraform-openstack-tor-obfs4-bridge (but this will move to GitHub so that it can be published in the Terraform registry)

This module was written for OVH, which uses the OpenStack API, and so does Gandi, so it should be possible to modify this module to also run on Gandi and in the process make it more applicable to other OpenStack providers too.

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information