osmo_sock_get_name(): clearly indicate local and remote

In a string like

  127.0.0.1:2905<->127.0.0.1:60661

it is hard to tell which is the local part. I'd have expected it on the left,
but it is actually on the right.

To avoid doubt and bypass bikesheds on which side should be what, clearly mark
the two sides as remote and local.

  (r=127.0.0.1:2905<->l=127.0.0.1:60661)

Change-Id: I43dcc6a1906429bd0955fd7fe2eb5b8495b592d8
diff --git a/src/socket.c b/src/socket.c
index b74edd4..28d9b1c 100644
--- a/src/socket.c
+++ b/src/socket.c
@@ -607,11 +607,11 @@
 	if (rc < 0)
 		goto local_only;
 
-	return talloc_asprintf(ctx, "(%s:%s<->%s:%s)", hostbuf_r, portbuf_r,
+	return talloc_asprintf(ctx, "(r=%s:%s<->l=%s:%s)", hostbuf_r, portbuf_r,
 				hostbuf_l, portbuf_l);
 
 local_only:
-	return talloc_asprintf(ctx, "(NULL<->%s:%s)", hostbuf_l, portbuf_l);
+	return talloc_asprintf(ctx, "(r=NULL<->l=%s:%s)", hostbuf_l, portbuf_l);
 }
 
 #endif /* HAVE_SYS_SOCKET_H */