add spec for testing when handle_silenced is left as the default
add spec for testing when handle_silenced is left as the default

dzeleski/sensu-puppet,madelaney/sensu-puppet,sensu/sensu-puppet,jeffmccune/sensu-puppet,dzeleski/sensu-puppet,sensu/sensu-puppet,bovy89/sensu-puppet,jeffmccune/sensu-puppet,madelaney/sensu-puppet,bodgit/sensu-puppet,dzeleski/sensu-puppet,madelaney/sensu-puppet,bodgit/sensu-puppet,bodgit/sensu-puppet,bovy89/sensu-puppet,bovy89/sensu-puppet,sensu/sensu-puppet,jeffmccune/sensu-puppet