Replace connection **failed ** to user-friendly format.
```
sever@vyos-1.3-bgp:~$ show ipoe-server sessions
Connection to "localhost:2002" failed
sever@vyos-1.3-bgp:~$ show ipoe-server statistics
Connection to "localhost:2002" failed
sever@vyos-1.3:~$ show l2tp-server sessions
Connection to "localhost:2004" failed
```