scanner: default to `swh.model.discovery` policy
The RandomDirSamplingPriority is backed by swh.model
and it seems like
a good idea to standardize on it. We set it as the default before
removing the other ones.
Staging instance, all changes can be removed at any time
The RandomDirSamplingPriority is backed by swh.model
and it seems like
a good idea to standardize on it. We set it as the default before
removing the other ones.