When we have multiple radius-servers, will be good to have a possibility set priority
for `crux`
```
set system login radius-server 10.0.0.1 priority 1
set system login radius-server 10.0.0.2 priority 2
```
for `rolling`
```
set system login radius server 10.0.0.1 priority 1
set system login radius server 10.0.0.2 priority 2
```