DOMDataTreeCommitCohortRegistry is unaccessible for applications trying to perform datastore validation via DOMDataTreeCohorts, (it is not accesible via getSupportedExtensions() in DOMDataBroker, neither available for direct blueprint inyection in the service registry).

At least one of the mechanisms should be added (Tom Pantelis pointed out that the latter is preferable in [1])

[1] https://lists.opendaylight.org/pipermail/controller-dev/2017-January/012992.html