Completed singleton and N-node cluster boot up and joining phase.

* Simplified node join phase.
* Added tests for cluster node startup and joining, both for singleton cluster and 2-node cluster.
* Fixed bug in cluster node address and cluster daemon lookup.
* Changed some APIs.
* Renamed 'contact-point' to 'node-to-join'.
* Minor refactorings.

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

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

@@ -8,19 +8,9 @@
 akka {
 
   cluster {
-<<<<<<< HEAD
     # node to join - the full URI defined by a string on the form of "akka://system@hostname:port"
     #     leave as empty string if the node should be a singleton cluster
     node-to-join = ""
-=======
-    join {
-      # contact point on the form of "hostname:port" of a node to try to join
-      #     leave as empty string if the node should be a singleton cluster
-      contact-point = ""
-      timeout = 30s
-      max-time-to-retry = 30s
-    }
->>>>>>> Removed cluster seed nodes, added 'join.contact-point', changed joining phase, added singleton cluster mode plus misc other changes.
 
     gossip {
       initialDelay = 5s

akka-cluster/src/test/scala/akka/cluster/ClusterConfigSpec.scala

@@ -25,11 +25,7 @@ class ClusterConfigSpec extends AkkaSpec(
       import settings._
       FailureDetectorThreshold must be(8)
       FailureDetectorMaxSampleSize must be(1000)
-
-      JoinContactPoint must be(None)
-      JoinTimeout must be(30 seconds)
-      JoinMaxTimeToRetry must be(30 seconds)
-
+      NodeToJoin must be(None)
       GossipInitialDelay must be(5 seconds)
       GossipFrequency must be(1 second)
     }