MINOR: receiver: move the FOREIGN and V6ONLY options from listener to settings

The new RX_O_FOREIGN, RX_O_V6ONLY and RX_O_V4V6 options are now set into
the rx_settings part during the parsing, so that we don't need to adjust
them in each and every listener anymore. We have to keep both v4v6 and
v6only due to the precedence from v6only over v4v6.
diff --git a/src/sock_inet.c b/src/sock_inet.c
index 3f4edcb..0506c16 100644
--- a/src/sock_inet.c
+++ b/src/sock_inet.c
@@ -116,7 +116,7 @@
 	}
 }
 
-/* Returns true if the passed FD corresponds to a socket bound with LI_O_FOREIGN
+/* Returns true if the passed FD corresponds to a socket bound with RX_O_FOREIGN
  * according to the various supported socket options. The socket's address family
  * must be passed in <family>.
  */