VTY: improve VTY prompt and make sure exit/end works everywhere

Some nodes below 'config' didn't have ournode_exit / ournode_end,
and thus were not able to properly perform this function.  exit should
always only go back one level, while end drops us back to ENABLE_NODE.

The prompt now represents the nesting level, and there's one consistent
space after the final prompt character (typically #).
diff --git a/openbsc/src/gprs/gb_proxy_vty.c b/openbsc/src/gprs/gb_proxy_vty.c
index 574f45f..bfa1f3b 100644
--- a/openbsc/src/gprs/gb_proxy_vty.c
+++ b/openbsc/src/gprs/gb_proxy_vty.c
@@ -40,7 +40,7 @@
  */
 static struct cmd_node gbproxy_node = {
 	GBPROXY_NODE,
-	"%s(gbproxy)#",
+	"%s(config-gbproxy)# ",
 	1,
 };