[TEST] create client nodes using node.client: true

Create client nodes using `node.client: true` instead of `node.data: false` and `node.master: false`.

We should create client nodes in our test infra using the `node.client:true` settings as that is the one that users use, and the one that we use as well in `ClientNodePredicate` thus we end up not finding client nodes otherwise as they weren't created with the proper setting.

Updated also the `DataNodePredicate` so that `client: true` is enough, no need for `data: false` as well.
can we use `== false`?