* Update plugins/singleusergroup from branch 'stable-3.0'
to 8a3b6faeaebc0f9b7d1af19eb0022b32994e476a
- Merge branch 'stable-2.16' into stable-3.0
* stable-2.16:
SingleUserGroupTest: Remove unnecessary groupBackend member
Change-Id: I6e091ea1d7381ddc176948aa3def7de4adc879db
- SingleUserGroupTest: Remove unnecessary groupBackend member
The GroupBackend is provided in the base class.
Change-Id: I61500178ca37af70e002f4d46fcdc534f8cde325