exchange shared secret

apps/federation/api/ocsauthapi.php

apps/federation/appinfo/application.php

apps/federation/appinfo/database.xml

apps/federation/appinfo/routes.php

apps/federation/backgroundjob/getsharedsecret.php

apps/federation/backgroundjob/requestsharedsecret.php

apps/federation/lib/dbhandler.php

apps/federation/lib/trustedservers.php

apps/federation/settings/settings-admin.php

apps/federation/tests/api/ocsauthapitest.php

apps/federation/tests/lib/dbhandlertest.php

apps/federation/tests/lib/trustedserverstest.php