Update get_admins in ShrunkClient
Update get_admins in ShrunkClient

Allows the client to return more information about the administrators
(specifically, who added them).

oss/shrunk,ksuarz/shrunk,ksuarz/shrunk,oss/shrunk,oss/shrunk,ksuarz/shrunk,oss/shrunk,oss/shrunk,ksuarz/shrunk