Bogus shared::$path storage on master

[PVince81]

Steps

1. Create two users "user1" and "user2"
2. Login as "user1"
3. Create a folder "test"
4. Share "test" with "user2"
5. Login as "user2"
6. Check "oc_storages"

Expected result

No entries for local shares.

Actual result

An extra entry "shared::test" is created.

MariaDB [owncloud]> select * from oc_storages;
+---------------------------------------+------------+-----------+--------------+
| id                                    | numeric_id | available | last_checked |
+---------------------------------------+------------+-----------+--------------+
| home::root                            |          1 |         1 |         NULL |
| local::/srv/www/htdocs/owncloud/data/ |          2 |         1 |         NULL |
| home::user1                           |          3 |         1 |         NULL |
| home::user2                           |          4 |         1 |         NULL |
| shared::/test                         |          5 |         1 |         NULL |
+---------------------------------------+------------+-----------+--------------+

Versions

ownCloud 8.2 pre-alpha git master (d93bf35)

Regression from 8.1.1

I'm going to bisect this.

[PVince81]

First breaking commit df19cab from #13641

@Xenopathic can you have a look ? Not all storage types should have their availability written in the DB.
At least not the local shares.
Remote shares (federation) might be fine, IIRC they will get an entry there.