Fix formCluster to remove raft log files associated with stand-alone cluster configuration

Change-Id: Icdacec468c95403ac6c97ae7be5b5fcc63661c76

@@ -15,8 +15,8 @@
  */
 package org.onosproject.cluster.impl;
 
-import com.google.common.collect.Collections2;
 import com.google.common.collect.Sets;
+
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Deactivate;
@@ -26,6 +26,7 @@ import org.apache.felix.scr.annotations.Service;
 import org.apache.karaf.system.SystemService;
 import org.joda.time.DateTime;
 import org.onlab.packet.IpAddress;
+import org.onlab.util.Tools;
 import org.onosproject.cluster.ClusterAdminService;
 import org.onosproject.cluster.ClusterEvent;
 import org.onosproject.cluster.ClusterEventListener;
@@ -152,6 +153,8 @@ public class ClusterManager
         clusterMetadataAdminService.setClusterMetadata(metadata);
         try {
             log.warn("Shutting down container for cluster reconfiguration!");
+            // Clean up persistent state associated with previous cluster configuration.
+            Tools.removeDirectory(System.getProperty("karaf.data") + "/partitions");
             systemService.reboot("now", SystemService.Swipe.NONE);
         } catch (Exception e) {
             log.error("Unable to reboot container", e);
@@ -184,10 +187,7 @@ public class ClusterManager
         List<ControllerNode> sorted = new ArrayList<>(nodes);
         Collections.sort(sorted, (o1, o2) -> o1.id().toString().compareTo(o2.id().toString()));
         Set<Partition> partitions = Sets.newHashSet();
-        // add p0 partition
-        partitions.add(new DefaultPartition(PartitionId.from(0),
-                                            Sets.newHashSet(Collections2.transform(nodes, ControllerNode::id))));
-        // add extended partitions
+        // add partitions
         int length = nodes.size();
         int count = Math.min(3, length);
         for (int i = 0; i < length; i++) {