vty: Write 'neighbor resolution' config to file

Fixes: c0a250d17d79e08763f77cdf58e970dc2e65e7d3
Related: SYS#4909
Change-Id: I44eef3826939e05ba88e0c5a67e1fef535582ba7
diff --git a/src/pcu_vty.c b/src/pcu_vty.c
index 6db8b05..92ff8eb 100644
--- a/src/pcu_vty.c
+++ b/src/pcu_vty.c
@@ -250,6 +250,11 @@
 	else
 		vty_out(vty, " gb-dialect classic%s", VTY_NEWLINE);
 
+	if (the_pcu->vty.neigh_ctrl_addr) {
+		vty_out(vty, " neighbor resolution %s %u%s",
+			the_pcu->vty.neigh_ctrl_addr, the_pcu->vty.neigh_ctrl_port, VTY_NEWLINE);
+	}
+
 	osmo_tdef_vty_write(vty, the_pcu->T_defs, " timer ");
 
 	return CMD_SUCCESS;