Overview:
  This resource allows user lookup.

Method GET:
  Retrieve the user information.

  Query Arguments:
    primary_gid=<integer>
      The user's primary group ID.
    gid=<integer>
      The IDs of the groups that the user belongs to.
    user=<string>
      The user name.
    zone=<string>
      The zone the user bolongs to.
    uid=<integer>
      The user ID.

