9375f3bd6c
The `stack` script has been consistently failing with:
```
Error: Nexthop has invalid gateway.
```
when it comes time to add a route to $PUBLIC_SUBNET_IP [1].
One solution to this is to add the `onlink` flag [2] to the link
mentioned above:
```
onlink pretend that the nexthop is directly attached to
this link, even if it does not match any interface
prefix.
```
[1] daf856cd2d/devstack/lib/ironic (L2583)
[2] https://man7.org/linux/man-pages/man8/ip-route.8.html
Change-Id: Ia6363e6b68de344dd82106077efff86143e63d39
Signed-off-by: Luan Utimura <luan.utimura@luizalabs.com>