Relase with new access rights: test user accounts

[e-maud]

To verify that access rights are correctly implemented and managed end-to-end in the new infrastructure, we need shared fake/test user accounts for testing.

• test_guest
• test_basic
• test_student
• test_academic
• test_specialarchive

For real testing we still need to have everything in place, but we can already have the account created.

• @e-maud: preparation of internal test user accounts and sharing of credentials
• @theorm or @danieleguido creation of accounts when feasible / possible