Reduce size of jenkins logs

Each build is now over 40mb logs.

A lot of DEBUG logging was left on for test failures that have been
fixed. Added an issue # for ones that are still valid or if if it on
as the test verifies debug

akka-cluster-tools/src/multi-jvm/scala/akka/cluster/singleton/MultiDcSingletonManagerSpec.scala

@@ -21,7 +21,6 @@ object MultiDcSingletonManagerSpec extends MultiNodeConfig {
   val third = role("third")
 
   commonConfig(ConfigFactory.parseString("""
-    akka.loglevel = DEBUG
     akka.actor.provider = "cluster"
     akka.actor.serialize-creators = off
     akka.remote.log-remote-lifecycle-events = off"""))