At the moment only Readability & wallabag v2 import allow created_at import.
Pocket removed `time_added` field from their API v2 to v3...
And wallabag v1 doesn't export that value.
Instead of queing real Entry to process, we queue all the item to import from Pocket in a raw format.
Then, the worker retrieve that information, find / create the entry and save it.
graby will throw an Exception in some case (like a bad url, a restricted url or a secured pdf).
Import doesn't handle that case and break the whole import.
With that commit the import isn't stopped but the entry is just skipped.
Also, as a bonus, I've added extra test on WallabagImportV2 when the json is empty.
Instead of using a HTTP request we just login user like FOSUser does.
It allows us to mock service in container for functional tests.
Also, fix a bad config name in fos_user for firewall
And finally, add functional test to PocketImport
