clusterd: Fix restart

Currently restart isn't working, because we removed 'kill'
from the options and udp_rx_restart is using it.

Just exit instead, the service manage should restart the service.

clusterd/clusterd

@@ -68,28 +68,6 @@ sub decode {
     return @$msg;
 }
 
-sub kill_previous_server { # kill_previous_server('clusterd')
-    my ($command)=@_;
-    my $ret=0;
-
-    # quickfix - dont kill our parent which might be the init.d/script with the same name....
-
-    my $ppid;
-    for (`ps -o ppid,comm -p $$`) {
-        $ppid=$1 if /(\d+)/;
-    }
-
-    for (`ps -Ao pid,comm`) {
-        my @F=split;
-        if ($F[1] eq $command && $F[0] ne $$ && $F[0] ne $ppid) {
-            kill 1=>$F[0];
-            warn "stopped $command pid $F[0]\n";
-            $ret=1;
-        }
-    }
-    return $ret;
-}
-
 #-------------------------------------
 package main;
 
@@ -1244,15 +1222,10 @@ sub log_to_stat_target {
 # ----------------------------------------------------------
 
 sub udp_rx_restart {
-    # double-fork, because kill_previous_server() won't kill its parent
-    my $pid=fork;
-    if (defined $pid && $pid==0) {
-        my $pid2=fork;
-        if (defined $pid2 && $pid==0) {
-            exec '/usr/sbin/clusterd','--kill','--daemon';
-            die "exec failed: $!\n";
-        }
-    }
+    # just exit and leave the restart to the service manager
+    # exist status 40 can be used with RestartForceExitStatus=
+    warn "received restart request. Exiting with status 40\n";
+    exit 40;
 }
 
 sub udp_rx_flush_gidcache {
@@ -2219,8 +2192,6 @@ if (defined $options{'push'}) {
     My::Select::run();
 } elsif ($options{'lsof'}) {
     lsof($options{'lsof'});
-} elsif ($options{'kill'}) {
-    Donald::Tools::kill_previous_server('clusterd');
 } else {
     @ARGV or die USAGE;
     my ($cmd,@args)=@ARGV;