[objstorage] Support a basic authentication configuration

Following #3621 (closed), the objstorage client should support a username / password to use when the server is protected by a basic authentication

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Migrated from T3702 (view on Phabricator)

added Object storage System administration priority:Normal labels

The basic auth is working with the default remote implementation if the credentials are specified in the url like https://user:password@objstorage_url

closed

mentioned in issue #3621 (closed)