Fix a couple of uglinesses in the test suite caused by newer Ruby

Fix a couple of uglinesses in the test suite caused by newer Ruby

diff --git a/lib/mobystash/logstash_writer.rb b/lib/mobystash/logstash_writer.rb
index 53babd2..303650c 100644
--- a/lib/mobystash/logstash_writer.rb
+++ b/lib/mobystash/logstash_writer.rb
@@ -156,7 +156,7 @@ class LogstashWriter
         @worker_thread = Thread.new do
           Thread.current.name = "LogstashWriter"
           write_loop
-        end
+        end.tap { |t| t.report_on_exception = false }
       end
     end
 
diff --git a/lib/mobystash/system.rb b/lib/mobystash/system.rb
index 8f16631..02ff4ce 100644
--- a/lib/mobystash/system.rb
+++ b/lib/mobystash/system.rb
@@ -170,7 +170,7 @@ module Mobystash
           sleep @config.state_checkpoint_interval
           @queue.push([:checkpoint_state])
         end
-      end
+      end.tap { |t| t.report_on_exception = false }
     end
 
     def write_state_file

GitHub sha: 9b2a9ee7