In this example first port is greater than the last port
```
set firewall group port-group PORTGRP port '25-1'
```
Expected validation, for example:
```
vyos@r4# set firewall group port-group PGRP port 25-1
Error: [25-1] is not a valid port range
Value validation failed
```
Also it allows to set out of port range value:
```
set firewall group port-group PORTGRP port 70000
```