775bfca1a6
The test assumed that `ggatel create` created a device on completion, but that's incorrect. This squashes the race by waiting for the device to appear, as `ggatel create` daemonizes before issuing an ioctl to geom_gate(4) if not called with `-v`. Discussed with: asomers MFC after: 1 week PR: 204616 Sponsored by: Dell EMC Isilon