Fix host_id CLI argument

src/cli/one_helper.rb

@@ -281,6 +281,8 @@ EOT
     end
 
     def OpenNebulaHelper.name_to_id(name, poolname, user_flag=-2)
+        return 0, name if name.match(/^[0123456789]+$/)
+
         client = OpenNebula::Client.new
         # TBD user_flag
         pool = case poolname