clusterd: Send stat messages to afk

Each clusterd sends regular status messages (version and load
information) to a single clusterd which currently just collects them for
operator review.

    buczek@macheteinfach:~/git/mxtools (phaseout-lol)$ telnet lol 234
    Trying 141.14.29.220...
    Connected to lol.
    Escape character is '^]'.
    clusterd 20220118-124724 stupid console
    For historical messages, grep "clusterd" from /var/log/messages on lol (or "tail -f /var/log/messages |grep cluster")
    v
            abelson : ['DOWN',0,28,'0.01','V1.108 - 20170215-151907',0,'434420.8','4.9.38.mx64.164']
                ace : ['UP','95647416.84',1,0,'20220118-124724',0,'921594.24','5.10.70.mx64.403']
             acedia : ['UP',0,1,'0.72','20220118-124724','0.00104166666666667','30613821.35','5.10.24.mx64.375']
                afk : ['UP','95647391.2',1,'0.1','20220118-124724',0,'5941821.44','4.14.87.mx64.236']
       agentwhiskey : ['UP',0,1,'0.07','20220118-124724',0,460800,'5.10.82.mx64.414']
    [...]
    Connection closed by foreign host.

The utility of this can be debated and maybe we should remove that
completely.

Anyway, for now send status messages to "afk" instead of "lol", because "lol" is
going to be taken out of commission.

clusterd/clusterd

@@ -1243,7 +1243,7 @@ sub loadavg {		# AXP : (system load average)  ,  LINUX: (system load average, pl
 	}
 }
 
-our $STAT_TARGET='lol';
+our $STAT_TARGET='afk';
 our $STAT_SEQ=0;
 sub send_stat {
 		My::Select::timeout_requeue(600);