External Storage Support "storage not available" error

[tflidd]

There are some remarks in the announcement for the release candidates:

ownCloud RCs for maintenance releases are out, please help testing!

Ok, here's a changelog for the RCs: 9.1.1 Core: Remove OCS response body for HTTP status 204 and 304 which disturbed some firewalls - core/#25835 Core: Map Oracle driver options to params - core/#23938 Core: Log cron job class name for easier troubleshooting - core/#25743 Core: Skip version and trash expiry for users that never logged in - core/#25741 Core: Added white download icons for apps to use - core/#23891 Core: Fix warning about undefined offset in LoginController - core/#25714 Core…