Adding consolidation algorithm approach

cloudsim-plus/src/main/java/org/cloudbus/cloudsim/allocationpolicies/migration/VmAllocationPolicyMigrationSlaFixedTightHost.java

 package org.cloudbus.cloudsim.allocationpolicies.migration;
 
+import java.util.Collections;
 import java.util.List;
 import java.util.Map;
 
@@ -61,6 +62,7 @@ public class VmAllocationPolicyMigrationSlaFixedTightHost extends VmAllocationPo
 		Map<Vm, Host> migrationMap = super.getOptimizedAllocationMap(vmList);
 		
 		// Consolidate Loose hosts
+		optimisticConsolidation(migrationMap);
 		
 		return migrationMap;
 	}
@@ -96,8 +98,31 @@ public class VmAllocationPolicyMigrationSlaFixedTightHost extends VmAllocationPo
 		return bestCandidateHost;
 	}
 	
-	private boolean isTightHost(Host host) {
-		return host.getIopsProvisioner() instanceof ResourceProvisionerShared;
+	private Map<Vm, Host> optimisticConsolidation(Map<Vm, Host> actualMigrationMap) {
+		
+		List<Host> orderedLooseHosts = getOrderedLooseHosts();
+		
+		for (int i = 0; i < orderedLooseHosts.size(); i++) {		
+			for (int j = orderedLooseHosts.size() - 1; j >= 0; j--) {	
+				if(i >= j)
+					continue;
+				for (Vm vm : orderedLooseHosts.get(i).getVmList()) {			
+					if(orderedLooseHosts.get(j).isSuitableForVm(vm)) {
+						actualMigrationMap.put(vm, orderedLooseHosts.get(j));
+					}			
+				}		
+			}			
+		}
+		
+		return actualMigrationMap;
+	}
+	
+	// Returns the list of loose hosts ordered (increse order) by the number of Vm
+	private List<Host> getOrderedLooseHosts() {
+		List<Host> looseHosts = getHostsWithLooseSla();
+		sort(looseHosts);
+		Collections.reverse(looseHosts);
+		return looseHosts;
 	}
 	
 	private int getVmsThreshold() {