Allow ip6 server search for non-admin

Registered by Dr. Jens Harbott

Add ``ip6`` to the list of options that are allowed for non-admins when
listing servers.

Blueprint information

Status:
Complete
Approver:
None
Priority:
Undefined
Drafter:
Dr. Jens Harbott
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Dr. Jens Harbott

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