B #6319: Skip if elastic

Do not execute the elastic drivers post operation on snapshot-revert,
these operations are related to the hypervisor and not the VM.

(cherry picked from commit 60f00b49a356c603437ac09817c09bdb06bbcd5a)

src/vmm_mad/exec/one_vmm_exec.rb

@@ -833,6 +833,7 @@ def snapshot_revert(id, drv_message)
             {
                 :driver       => :vnm,
                 :action       => :post,
+                :skip         => ['elastic'],
                 :parameters   => [:deploy_id, :host]
             }
         ]

src/vnm_mad/one_vnm.rb

@@ -49,7 +49,8 @@ def initialize(vnm_drivers, options = {})
     def do_action(id, aname, ops = {})
         options={
             :stdin      => nil,
-            :parameters => nil
+            :parameters => nil,
+            :skip       => nil
         }.merge(ops)
 
         cmd_params =  ''
@@ -59,6 +60,8 @@ def do_action(id, aname, ops = {})
         infos  = ''
 
         @vnm_drivers.each do |subdirectory|
+            next if options[:skip] && options[:skip].include?(subdirectory)
+
             cmd = action_command_line(aname, cmd_params, nil, subdirectory)
 
             if action_is_local?(aname, subdirectory)