When setting a blackholed static route, the distance is not set correctly
Sample config
```
protocols {
static {
route 0.0.0.0/8 {
blackhole {
distance 80
}
}
}
}
```
'ip ro' command then displays
```
blackhole 0.0.0.0/8 proto static metric 20
```
'route -n' also dislayed incorrect metric
```
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
0.0.0.0 0.0.0.0 255.0.0.0 U 20 0 0 *
```