tools: always append "exit" in frr-reload.py

When reloading the following config:
```
router ospf6
 area 0 range 2001:db8::/32 advertise
exit
!
interface eth0
 ipv6 ospf6 area 0
exit
```
frr-reload.py doesn't execute "exit" commands. Because of that, it tries
to execute "interface eth0" inside the "router ospf6" context and fails.

To always execute all commands from the correct context, frr-reload.py
should properly exit from every entered node.

Fixes #10132.

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

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