Add Openflow related RCs

Two remarks:
1. I guess that function "success?" in file omf/omf_common/lib/omf_common/message.rb is wrongly defined, since the word "error" should be replaced by the word "ERROR".
2. The line "opts = Hashie::Mash.new(opts)" does not work properly if I comment out it in the hook ":before_create" in the factory RCs
3. One more time, I note that you should replace "OmfRc::ResourceFactory.load_addtional_resource_proxies" with "OmfRc::ResourceFactory.load_additional_resource_proxies"