separate clients for each HAL instance

At the moment HAL deposits content with three main instances:

• https://hal.archives-ouvertes.fr
• [Add ]https://inria.halpreprod.archives-ouvertes.fr

•  [Add] https://hal-test.archives-ouvertes.fr

When we started with the deposit, we didn't want to add all of HAL's portals: - http://hal.inria.fr - http://hal.in2p3.fr - https://hal-ens-lyon.archives-ouvertes.fr, etc.. we still don't want to do that.

All "real" deposits are accessible on the main portal- https://hal.archives-ouvertes.fr and we want to create two more clients for test-deposits.

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Migrated from T1647 (view on Phabricator)