FIX: token util keyurl definition move to above callback definition

resources/prosody-plugins/token/util.lib.lua

     self.requireRoomClaim = checkRoom;
 end
 
+function Util:clear_asap_cache()
+    self.cache = require"util.cache".new(cacheSize);
+end
+
 --- Returns the public key by keyID
 -- @param keyId the key ID to request
 -- @return the public key (the content of requested resource) or nil
         local code;
         local timeout_occurred;
         local wait, done = async.waiter();
+
+        local keyurl = path.join(self.asapKeyServer, hex.to(sha256(keyId))..'.pem');
+
         local function cb(content_, code_, response_, request_)
             if timeout_occurred == nil then
                 content, code = content_, code_;
                 module:log("warn", "public key reply delivered after timeout from: %s",keyurl);
             end
         end
+
         -- TODO: Is the done() call racey? Can we cancel this if the request
         --       succeedes?
         local function cancel()
             end
         end
 
-        local keyurl = path.join(self.asapKeyServer, hex.to(sha256(keyId))..'.pem');
         module:log("debug", "Fetching public key from: "..keyurl);
 
         -- We hash the key ID to work around some legacy behavior and make