introduce akka.actor.creation-timeout to make Jenkins happy

- I had reused akka.actor.timeout for ActorSystem.actorOf calls (which
  “ask” the guardian to create the actor), but 5sec proved too short for
  Jenkins
- CreationTimeout defaults to 30sec now, let’s hope Jenkins is not
  slower than _that_.

akka-actor/src/main/resources/reference.conf

@@ -36,6 +36,7 @@ akka {
 
   actor {
     provider = "akka.actor.LocalActorRefProvider"
+    creation-timeout = 20s           # Timeout for ActorSystem.actorOf
     timeout = 5s                     # Default timeout for Future based invocations
                                      #    - Actor:        ask && ?
                                      #    - UntypedActor: ask

akka-actor/src/main/scala/akka/actor/ActorSystem.scala

@@ -71,6 +71,7 @@ object ActorSystem {
 
     val ProviderClass = getString("akka.actor.provider")
 
+    val CreationTimeout = Timeout(Duration(getMilliseconds("akka.actor.creation-timeout"), MILLISECONDS))
     val ActorTimeout = Timeout(Duration(getMilliseconds("akka.actor.timeout"), MILLISECONDS))
     val SerializeAllMessages = getBoolean("akka.actor.serialize-messages")
 
@@ -300,19 +301,21 @@ class ActorSystemImpl(val name: String, applicationConfig: Config) extends Actor
 
   protected def systemImpl = this
 
-  implicit def timeout = settings.ActorTimeout
-
-  private[akka] def systemActorOf(props: Props, name: String): ActorRef =
+  private[akka] def systemActorOf(props: Props, name: String): ActorRef = {
+    implicit val timeout = settings.CreationTimeout
     (systemGuardian ? CreateChild(props, name)).get match {
       case ref: ActorRef ⇒ ref
       case ex: Exception ⇒ throw ex
     }
+  }
 
-  def actorOf(props: Props, name: String): ActorRef =
+  def actorOf(props: Props, name: String): ActorRef = {
+    implicit val timeout = settings.CreationTimeout
     (guardian ? CreateChild(props, name)).get match {
       case ref: ActorRef ⇒ ref
       case ex: Exception ⇒ throw ex
     }
+  }
 
   import settings._