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Tests added to make sure that removing an expire date when this is
enforced is not allowed.

A recent change that prevents reshare permission changes to delete group
share children had the side-effect of also preventing group share
children deletion when it needed to be done.

This fix adds an extra flag to isolate the "reshare permission change"
deletion case and keep the other ones as they were before, not only to
fix the regression but also fix other potential regressions in code that
uses this method.

Also updated the comment because now Helper::delete() is no longer
limited to reshares but also applies to group share children.

Fixed SQL query for whenever a user has more than one group.
Added missing $owner where clause for group lookup.
Added unit tests for the group cases.

Beside some small improvements and bug fixes this will probably the final state for OC8.

To test this you need to set up two ownCloud instances. Let's say:

URL: myPC/firstOwnCloud user: user1
URL: myPC/secondOwnCloud user: user2
Now user1 can share a file with user2 by entering the username and the URL to the second ownCloud to the share-drop-down, in this case "user2@myPC/secondOwnCloud".

The next time user2 login he will get a notification that he received a server-to-server share with the option to accept/decline it. If he accept it the share will be mounted. In both cases a event will be send back to user1 and add a notification to the activity stream that the share was accepted/declined.

If user1 decides to unshare the file again from user2 the share will automatically be removed from the second ownCloud server and user2 will see a notification in his activity stream that user1@myPC/firstOwnCloud has unshared the file/folder from him.

maintain deprecated \OC::$session when getting or setting the session via the server container or UserSession

restore order os OC::$session and OC::$CLI

remove unneded initialization of dummy session

write back session when $useCustomSession is true

log warning when deprecated app is used

This patch was automatically generated as part of the following inspection:
https://scrutinizer-ci.com/g/owncloud/core/inspections/cdfecc4e-a37e-4233-8025-f0d7252a8720

Enabled analysis tools:
 - PHP Analyzer
 - JSHint
 - PHP Copy/Paste Detector
 - PHP PDepend

updated the unit test for OCP\Share::unshareAll() to verify that shares by all users are removed for an item.