[TEST] Also wait for fields to have been applied in the mapping in cluster state during teh waitForConcreteMappingsOnAll call

The concrete DocMapper on the master will be updated before the mapping in the cluster state. The DocMapper is updated during the cluster update task. This can lead to occasional assertion failures on the mapping response, because that is based on the mapping the cluster state, which may not yet have been updated. (time window between the DocMapping is updated, but the mapping in the cluster state isn't)