NodeTestRunner should report inner exceptions for all exception types

[IgorFedchenko]

Having this line in MNTR logs:

[Node #1(node-1)][ERROR][1/23/2020 8:51:21 PM][Thread 0018][akka://ClusterMetricsEnabledSpec/system/log2-TestEventListener] The type initializer for 'Akka.Cluster.Metrics.Serialization.ClusterMetricsMessagesReflection' threw an exception.

This looks like a Message property of TypeInitializationException class - and usually the real issue is stored in InnerException property (or it's InnerException, or even deeper - but you got the idea).

Currently, NodeTestRunner is catching AggregateException and adding it's inner exceptions to failure report (logging them as well) - but for general Exception type only wrapping exception is logged, which is not enough in some cases (like above).

So need to report all inner exceptions of any thrown exception.