Correction of within time in TransformationSampleJapiSpec, see #2875

* We had the same issue in ticket 2820 and then the conclusion was that
  the within timeout should be increased due to "publish on convergence",
  but it was not done correctly in TransformationSampleJapiSpec, see
  https://github.com/akka/akka/commit/8bf7c03158cd4e064d3eecef1b331d14c2990775
* Also fixed the wrong (but harmless) subscribe in TransformationBackend
Throw startup exception from Remoting, see #2872

* The problem with NPE of defaultAddress was because if the
  init of the transport takes long time (network timeout) the
  defaultAddress was never set
Merge pull request #1008 from akka/wip-2875-TransformationSampleJapiSpec-patriknw

Correction of within time in TransformationSampleJapiSpec, see #2875
Merge pull request #1018 from akka/wip-2872-npe-defaultAddress-patriknw

Throw startup exception from Remoting, see #2872