KAFKA-19724: Global stream thread should not ignore any exceptions

[celikfatih]

Kafka Streams does not catch Error types that occur during
GlobalStreamThread initiation, and therefore it is not possible to
trace the error (for example, an ExceptionInInitializerError occurs
when RocksDB is not found for a global store). This is because errors
are not caught and logged.

The catch block in GlobalStreamThread#initialize() has been ensured to
catch Throwable instead of Exception. Additionally, the empty
setUncaughtHandler set operation that prevented this from taking
effect when users employed setUncaughtExceptionHandler has been removed.

Reviewers: Matthias J. Sax [email protected]

[mjsax]

Thanks for the PR. Overall LGTM. One nit about naming.