Pin dependencies and update vendors

vendor/github.com/grpc-ecosystem/grpc-gateway/utilities/BUILD

@@ -5,6 +5,7 @@ go_library(
     srcs = [
         "doc.go",
         "pattern.go",
+        "readerfactory.go",
         "trie.go",
     ],
     importmap = "k8s.io/kubernetes/vendor/github.com/grpc-ecosystem/grpc-gateway/utilities",

vendor/github.com/grpc-ecosystem/grpc-gateway/utilities/pattern.go

@@ -17,6 +17,6 @@ const (
 	OpConcatN
 	// OpCapture pops an item and binds it to the variable
 	OpCapture
-	// OpEnd is the least postive invalid opcode.
+	// OpEnd is the least positive invalid opcode.
 	OpEnd
 )

vendor/github.com/grpc-ecosystem/grpc-gateway/utilities/readerfactory.go

@@ -0,0 +1,20 @@
+package utilities
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+)
+
+// IOReaderFactory takes in an io.Reader and returns a function that will allow you to create a new reader that begins
+// at the start of the stream
+func IOReaderFactory(r io.Reader) (func() io.Reader, error) {
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+
+	return func() io.Reader {
+		return bytes.NewReader(b)
+	}, nil
+}