Refactoring send-out-port_spec.rb, thanks Nick-san (refs #236)
Stop using #should instead use #expect. See also http://myronmars.to/n/dev-blog/2012/06/rspecs-new-expectation-syntax (refs #236)
provide OFPRR_* constants in FlowRemoved namespace
provide OFPPF_* constants in Port namespace
provide OFPFW_* constants in Match namespace
provide OFPR_* constants in PacketIn namespace