Clouding process times out constantly leading to Cloud 1 under 4 error

Following tests are regularly failing builds due to `Cloud 1 under 4` error:

Java 8 XGBoost Multinode JUnit / hex.tree.xgboost.BoosterParmsTest.testGetLocalized
Java 8 JUnit / ai.h2o.targetencoding.TargetEncoderModelTest.testTargetEncoderModel

On the screenshot it could be seen that test starts after about 50 seconds after clouding was started and cloud reaches 4 nodes only after tests have already been started.

Suggestion:
1) increase default clouding time from 30 secs to 60 secs
2) Improve logging so that it can be seen when we give up waiting for proper cloud. Add suggestion to increase timeout