Add functionality for normal users to view the full data of /servers.json

[MegaManSec]

This patch provides the functionality of allowing certain accounts to view the full output of /servers.json, including server administrators.

Previously, the only users which could view this data in full were sysadmins, which does not comply with the least privilege principle of security (they are able to make changes to keys, while only needing to view read-only data).