I think I found out what causes the NPE above in .92 and why it works in
version 0.80
The component name (a.k.a. role name) is "solo___super" i.e. it has 3 "_"
In 0.92, it seems a new concept of "Role Group" is introduced, which was
not present in 0.80.
In 0.92 - AgentProviderService.java
Slider 0.92 on secured hadoop 2.6 cluster
Have a app with component "tenant1" running. Add another component
"tenant2" and do a upgrade. After that, the original component keeps
showing "awaiting heartbeat..." in the output of "slider list
--containers" ... The component and AM log does not seem
