F#2153 Do Command flush requires one parameter to run (#2154)

## USAGE
flush <range|hostid_list>
        Disables the host and reschedules all the running VMs in it.

## OPTIONS
     -h, --help                Show this message
     -V, --version             Show version and copyright information
     --user name               User name used to connect to OpenNebula
     --password password       Password to authenticate with OpenNebula
     --endpoint endpoint       URL of OpenNebula xmlrpc frontend command more configurable

src/cli/etc/onehost.yaml

@@ -74,3 +74,6 @@
 - :ALLOCATED_CPU
 - :ALLOCATED_MEM
 - :STAT
+
+:default_actions:
+  - :flush: resched

src/oca/ruby/opennebula/host.rb

@@ -17,6 +17,7 @@
 
 require 'opennebula/pool_element'
 require 'base64'
+require 'yaml'
 
 module OpenNebula
     class Host < PoolElement
@@ -127,6 +128,12 @@ module OpenNebula
         def flush()
             self.disable
 
+            begin
+                action = YAML.load_file("/etc/one/cli/onehost.yaml")[:default_actions][0][:flush]
+            rescue Exception => e
+                STDERR.puts e
+            end
+
             vm_pool = OpenNebula::VirtualMachinePool.new(@client,
                                                 VirtualMachinePool::INFO_ALL_VM)
 
@@ -139,7 +146,14 @@ module OpenNebula
             vm_pool.each do |vm|
                 hid = vm['HISTORY_RECORDS/HISTORY[last()]/HID']
                 if hid == self['ID']
-                    vm.resched
+                    case action
+                    when "resched"
+                        vm.resched
+                    when "delete-recreate"
+                        vm.recover(4)
+                    else
+                        vm.resched
+                    end
                 end
             end
         end