Add go-openapi dependencies and update Godeps

vendor/github.com/go-openapi/runtime/discard.go

@@ -0,0 +1,9 @@
+package runtime
+
+import "io"
+
+// DiscardConsumer does absolutely nothing, it's a black hole.
+var DiscardConsumer = ConsumerFunc(func(_ io.Reader, _ interface{}) error { return nil })
+
+// DiscardProducer does absolutely nothing, it's a black hole.
+var DiscardProducer = ProducerFunc(func(_ io.Writer, _ interface{}) error { return nil })