*: explicitly print "exit" at the end of every node config

There is a possibility that the same line can be matched as a command in
some node and its parent node. In this case, when reading the config,
this line is always executed as a command of the child node.

For example, with the following config:
```
router ospf
 network 193.168.0.0/16 area 0
!
mpls ldp
 discovery hello interval 111
!
```
Line `mpls ldp` is processed as command `mpls ldp-sync` inside the
`router ospf` node. This leads to a complete loss of `mpls ldp` node
configuration.

To eliminate this issue and all possible similar issues, let's print an
explicit "exit" at the end of every node config.

This commit also changes indentation for a couple of existing exit
commands so that all existing commands are on the same level as their
corresponding node-entering commands.

Fixes #9206.

Signed-off-by: Igor Ryzhov <iryzhov@nfware.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/zebra/interface.c b/zebra/interface.c
index 21eeb20543..18f7503f82 100644
--- a/zebra/interface.c
+++ b/zebra/interface.c
@@ -4096,7 +4096,7 @@ static int link_params_config_write(struct vty *vty, struct interface *ifp)
 	if (IS_PARAM_SET(iflp, LP_RMT_AS))
 		vty_out(vty, "  neighbor %pI4 as %u\n", &iflp->rmt_ip,
 			iflp->rmt_as);
-	vty_out(vty, "  exit-link-params\n");
+	vty_out(vty, " exit-link-params\n");
 	return 0;
 }
 
@@ -4188,7 +4188,7 @@ static int if_config_write(struct vty *vty)
 			zebra_evpn_mh_if_write(vty, ifp);
 			link_params_config_write(vty, ifp);
 
-			vty_endframe(vty, "!\n");
+			vty_endframe(vty, "exit\n!\n");
 		}
 	return 0;
 }