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Fix various PHPDoc issues in external storage app.

Added missing NoAdminRequired tag

When reading in old mount.json files, they do not contain config ids.
Since these are needed to be able to use the UI and the new service
classes, these will be generated automatically.

The config grouping is based on a config hash.

Fix expected result now that it returns the status.
Added isset for some properties that are not always present.

The mount options are now passed to the UI and stored in a hidden field.
The ext storage controllers and services also know how to load/save them
from the legacy config.

drop any fallback code related to curl - refs https://github.com/owncloud/core/pull/14838#issuecomment-78586447

- Added StorageConfig class to replace ugly arrays
- Implemented StorageService and StorageController for Global and User
  storages
- Async status checking for storages (from Xenopathic)
- Auto-generate id for external storage configs (not the same as
  storage_id)
- Refactor JS classes for external storage settings, this mostly
  moves/encapsulated existing global event handlers into the
  MountConfigListView class.
- Added some JS unit tests for the external storage UI

Since aa821ecc leading and trailing slashes are
trimmed in the file cache paths

We were using the SMB and SFTP backends, which since Icewind's new SMB library
results in an actual attempted connection just by constructing the storage.
This commit replaces all references to real storages (except when necessary)
with a dummy storage class.

This reverts commit 6a1a4880.

My IDE was crying...

Introduced with https://github.com/owncloud/core/commit/1df8a5a774ae5d665849daf74540d967826d5e11 in February 2013…