Create OpenFlow 1.3 Instructions

[yasuhito]

The following instructions should be created:

• goto_table
• write_metadata
• write_actions
• apply_actions
• clear_actions
• meter
• experimenter

[nickkaranatsios]

The following instruction classes are coded:

• InstructionList::GotoTable.new( :table_id => 2 )
• InstructionList::WriteMetadata.new( :metadata => rand( 2**64 ), :metadata_mask => rand( 2**64 ) )
• InstructionList::WriteActions.new( :actions => build_action_list )
• InstructionList::ApplyActions.new( :actions => build_action_list )
• InstructionList::ClearActions.new
• InstructionList::Meter.new( rand( 2**32 ) )
• InstructionList::Experimenter.new( :experimenter => rand( 2 ** 32 ), :user_data => rand( 36**10 ).to_s( 36 ).unpack( "C" ) )
  All classes reside under trema/instruction-list and a typical class looks like the following:

module Trema
  module InstructionList
    class InstructionActions < InstructionAccessor
      array :actions, :presence => true, :validate_with => :check_actions
    end


    def check_actions actions, name
      raise ArgumentError, "At least one action object must be specified for #{ name }" if actions.empty?
    end
  end
end

The InstructionAccessor class name TBD.