Misc changes, fixes and improvements after review.

- Renamed all 'frequency' to 'interval'
- Split up NodeJoinAndUpSpec and into NodeJoinSpec and NodeUpSpec.
- Split up MembershipChangeListenerJoinAndUpSpec and into MembershipChangeListenerJoinSpec and MembershipChangeListenerUpSpec.
- Added utility method 'startClusterNode()'
- Fixed race in register listener and telling node to leave
- Removed 'after' blocks
- Cleaned up unused code
- Improved comments

Signed-off-by: Jonas Bonér <jonas@jonasboner.com>

akka-cluster/src/multi-jvm/scala/akka/cluster/NodeUpSpec.scala

@@ -0,0 +1,50 @@
+/**
+ *  Copyright (C) 2009-2012 Typesafe Inc. <http://www.typesafe.com>
+ */
+package akka.cluster
+
+import com.typesafe.config.ConfigFactory
+import org.scalatest.BeforeAndAfter
+import akka.remote.testkit.MultiNodeConfig
+import akka.remote.testkit.MultiNodeSpec
+import akka.testkit._
+import akka.util.duration._
+
+object NodeUpMultiJvmSpec extends MultiNodeConfig {
+  val first = role("first")
+  val second = role("second")
+
+  commonConfig(debugConfig(on = false).withFallback(MultiNodeClusterSpec.clusterConfig))
+}
+
+class NodeUpMultiJvmNode1 extends NodeUpSpec
+class NodeUpMultiJvmNode2 extends NodeUpSpec
+
+abstract class NodeUpSpec
+  extends MultiNodeSpec(NodeUpMultiJvmSpec)
+  with MultiNodeClusterSpec {
+
+  import NodeUpMultiJvmSpec._
+
+  override def initialParticipants = 2
+
+  lazy val firstAddress = node(first).address
+  lazy val secondAddress = node(second).address
+
+  "A cluster node that is joining another cluster" must {
+    "be moved to UP by the leader after a convergence" taggedAs LongRunningTest in {
+
+      runOn(first) {
+        startClusterNode()
+      }
+
+      runOn(second) {
+        cluster.join(firstAddress)
+      }
+
+      awaitUpConvergence(numberOfMembers = 2)
+
+      testConductor.enter("after")
+    }
+  }
+}