Moved KEEPALIVE into a [tcp] section (only valid for TCP sockets).

ctrl/sockopts.ini

@@ -15,7 +15,7 @@
 ; SNDTIMEO
 ; RCVTIMEO
 ; REUSEADDR
-; KEEPALIVE
+; KEEPALIVE <- TCP only
 ; DONTROUTE
 ; BROADCAST
 ; OOBINLINE
@@ -24,9 +24,11 @@
 ; On some Unix platforms, additional TCP_* options are supported
 
 ; LINGER = 5
-KEEPALIVE = 1
 SNDBUF = 8192
 RCVBUF = 8192
 
+[tcp]
+KEEPALIVE = 1
+
 [bbs]
 TCP_NODELAY = 1