staticd: Accept full blackhole typed keywords for ip_route_cmd

Before this patch we allow entering next-hop interface address as any string.

Like, we can type: `ip route 10.10.10.10/32 bla`, but this will create a blackhole
route instead of using an interface `bla`.

The same is with reject.

After the patch:

```
$ vtysh -c 'con' -c 'ip route 10.10.10.100/32 bla'
ERROR: SET_CONFIG request failed, Error: nexthop interface name must be (reject, blackhole)

$ ip link show dev bla
472: bla: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN mode DEFAULT group default qlen 1000
    link/ether fa:45:bd:f1:f8:f0 brd ff:ff:ff:ff:ff:ff

$ vtysh -c 'sh run | include ip route'
$ vtysh -c 'con' -c 'ip route 10.10.10.100/32 blac'
$ vtysh -c 'sh run | include ip route'
ip route 10.10.10.100/32 blackhole

$ vtysh -c 'con' -c 'no ip route 10.10.10.100/32 blac'
$ vtysh -c 'sh run | include ip route'
$ vtysh -c 'con' -c 'ip route 10.10.10.100/32 blackhole'
$ vtysh -c 'sh run | include ip route'
ip route 10.10.10.100/32 blackhole

$ vtysh -c 'con' -c 'no ip route 10.10.10.100/32 blackhole'
$ vtysh -c 'sh run | include ip route'
$ vtysh -c 'con' -c 'ip route 10.10.10.100/32 Null0'
$ vtysh -c 'sh run | include ip route'
ip route 10.10.10.100/32 Null0

$ vtysh -c 'con' -c 'no ip route 10.10.10.100/32 Null0'
$ vtysh -c 'sh run | include ip route'
$
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>

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