feature #2470: Add column for zombie virtual machines

Patch from http://dev.opennebula.org/issues/2470

Changed so this new column is not displayed by default and the output
does not differ too much from 4.2.

(cherry picked from commit f1d8cfb197852cddcbef25b56b03e58eada35887)

src/cli/etc/onehost.yaml

@@ -17,6 +17,10 @@
   :desc: Number of Virtual Machines running
   :size: 3
 
+:ZVM:
+  :desc: Number of Virtual Machine zombies
+  :size: 3
+
 :TCPU: 
   :desc: Total CPU percentage
   :size: 4

src/cli/one_helper/onehost_helper.rb

@@ -53,6 +53,10 @@ class OneHostHelper < OpenNebulaHelper::OneHelper
                 d["HOST_SHARE"]["RUNNING_VMS"]
             end
 
+            column :ZVM, "Number of Virtual Machine zombies", :size=>3 do |d|
+                d["TEMPLATE"]["TOTAL_ZOMBIES"] || 0
+            end
+
             column :TCPU, "Total CPU percentage", :size=>4 do |d|
                 d["HOST_SHARE"]["MAX_CPU"]
             end