show reconfiguration failures
show reconfiguration failures

By this patch we fix few issues, which happen every time reconfiguration fails:
1) Zuul main thread terminates and whole process cannot be gracefully
terminated or reloaded
2) Initial exception isn't reported in logs, since it is re-raised from main thread,
and goes to stderr, which is lost when Zuul is run as a service

Change-Id: I52ff4a08315b8dcc6cb740dca12805cea4445d30

gooddata/zuul,wikimedia/integration-zuul,wikimedia/integration-zuul,gooddata/zuul,gooddata/zuul,gooddata/zuul,wikimedia/integration-zuul,wikimedia/integration-zuul,gooddata/zuul