Fix certificate watch hang
Fix certificate watch hang

If no certificate present, then once a day confluent could hang. Fix by
doing a non-blocking
read on the watcher.

xcat2/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,xcat2/confluent,xcat2/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent,jjohnson42/confluent