Remove optional dependency on swh.objstorage.cloud

If you want the archiver to have cloud abilities, install the
package python3-swh.objstorage.cloud on the server as well.

requirements.txt

@@ -11,7 +11,6 @@ flask
 # Internal dependencies
 swh.core >= 0.0.23
 swh.objstorage >= 0.0.2
-swh.objstorage.cloud >= 0.0.9
 
 click
 swh.scheduler

swh/archiver/__init__.py

@@ -3,11 +3,3 @@ from .director import ArchiverStdinToBackendDirector       # NOQA
 from .worker import ArchiverWithRetentionPolicyWorker      # NOQA
 from .worker import ArchiverToBackendWorker                # NOQA
 from .copier import ArchiverCopier                         # NOQA
-
-from swh.objstorage import register_objstorages
-from swh.objstorage.cloud import AzureCloudObjStorage  # noqa
-
-# Register new objstorage abilities
-register_objstorages({
-    'azure-storage': AzureCloudObjStorage
-})