Bug 1354: Fixed rpc request/result transformation.

This commit is dependent on https://git.opendaylight.org/gerrit/9232 commit in Yangtools project.
Fixed proper data transformation in toRpcRequest method in NetconfMessageTransformer.
Now every rpc request (edit-config, get and get-config) will be transformed for given Schema Context.

Change-Id: I08da9200c0ba680b36a445978e7de748e94b654d
Signed-off-by: Lukas Sedlak <lsedlak@cisco.com>
Merge "Bug 1354: Fixed rpc request/result transformation."