Add testcases on 06_permissions_spec.js

[duncdrum]

We currently test creation and deletion of a new users and groups as part of our end-to-end tests. We need addtional test cases for both users and groups to test

• completeness of the displayed info / forms
• its consistency (e.g. admin musts be member of dba)
• data updates are correctly stored and displayed

see #411

replaces:

• #taskid 44
• #taskid 46
• #taskid 42
• #taskid 43

functional tests of each field (expiration data) require unit tests of which we currently have none
see #402
see #408

see also evolvedbinary/fusion-studio-api#71