Allow a 'clone_target' configuration setting

If set, this setting will enable "fake DRS", cloning VMs onto the host
in the specified cluster containing the least amount of VMs.

lib/vmpooler/pool_manager.rb

@@ -195,9 +195,15 @@ module Vmpooler
            })
         )
 
+        # Choose a clone target
+        if ($config[:config]['clone_target']
+          $clone_target = $vsphere[vm['template']].find_least_used_host($config[:config]['clone_target'])
+        end
+
         # Put the VM in the specified folder and resource pool
         relocateSpec = RbVmomi::VIM.VirtualMachineRelocateSpec(
           :datastore    => $vsphere[vm['template']].find_datastore(datastore),
+          :host         => $clone_target,
           :diskMoveType => :moveChildMostDiskBacking
         )
 

lib/vmpooler/vsphere_helper.rb

@@ -51,6 +51,30 @@ module Vmpooler
 
 
 
+    def find_least_used_host cluster
+      begin
+        @connection.serviceInstance.CurrentTime
+      rescue
+        initialize()
+      end
+
+      hosts = Hash.new
+      hosts_sort = Hash.new
+
+      datacenter = @connection.serviceInstance.find_datacenter
+      datacenter.hostFolder.children.each do |folder|
+        next unless folder.name == cluster
+        folder.host.each do |host|
+          hosts[host.name] = host
+          hosts_sort[host.name] = host.vm.length
+        end
+      end
+
+      hosts[hosts_sort.sort_by { |k,v| v }[0][0]]
+    end
+
+
+
     def find_pool poolname
       begin
         @connection.serviceInstance.CurrentTime