Allowing Netty TLS bootstrap handler to be sharable.

Fixes #504
diff --git a/build.gradle b/build.gradle
index d83b400..b2387ee 100644
--- a/build.gradle
+++ b/build.gradle
@@ -252,6 +252,9 @@
     test {
         testLogging {
             exceptionFormat = 'full'
+            showExceptions true
+            showCauses true
+            showStackTraces true
         }
     }
 }