Make received OCC exit messages more visible in log.

Currently, OCC exit messages are only logged at some high debug level
(and if OpenVPN compiled with DEBUG), while control-channel EEN messages
are logged on verb 1.  Make this consistent, both in wording and in
log level.

Both messages are prefixed with the "channel" where the exit message
came in.

Signed-off-by: Gert Doering <gert@greenie.muc.de>
Acked-by: Frank Lichtenheld <frank@lichtenheld.com>
Message-Id: <20230814060409.50742-1-gert@greenie.muc.de>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg26949.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>
(cherry picked from commit 5f910a4)

src/openvpn/occ.c

@@ -429,7 +429,7 @@ process_received_occ_msg(struct context *c)
             break;
 
         case OCC_EXIT:
-            dmsg(D_PACKET_CONTENT, "RECEIVED OCC_EXIT");
+            dmsg(D_STREAM_ERRORS, "OCC exit message received by peer");
             register_signal(c->sig, SIGUSR1, "remote-exit");
             break;
     }

src/openvpn/push.c

@@ -192,7 +192,7 @@ server_pushed_signal(struct context *c, const struct buffer *buffer, const bool
 void
 receive_exit_message(struct context *c)
 {
-    dmsg(D_STREAM_ERRORS, "Exit message received by peer");
+    dmsg(D_STREAM_ERRORS, "CC-EEN exit message received by peer");
     /* With control channel exit notification, we want to give the session
      * enough time to handle retransmits and acknowledgment, so that eventual
      * retries from the client to resend the exit or ACKs will not trigger