Revert "Don't exit on shutdown, just break out (lets unit tests continue)"
Revert "Don't exit on shutdown, just break out (lets unit tests continue)"

This reverts commit 1f991c7417cab62252b1982767ef73af25f89fdc.

joekiller/logstash-kafka,joekiller/logstash-kafka,tinglinux/logstash-kafka,opentable/logstash-kafka,opentable/logstash-kafka,tinglinux/logstash-kafka,Aloomaio/logstash-kafka,Aloomaio/logstash-kafka