AppleHV enablement pass #2

* Use vfkit command line assembly
* Inject ignition file into guest using http over vsock
* Ready notification through use of vsock

[NO NEW TESTS NEEDED]

Signed-off-by: Brent Baude <bbaude@redhat.com>

vendor/github.com/gin-gonic/gin/internal/json/jsoniter.go

@@ -0,0 +1,24 @@
+// Copyright 2017 Bo-Yi Wu. All rights reserved.
+// Use of this source code is governed by a MIT style
+// license that can be found in the LICENSE file.
+
+//go:build jsoniter
+// +build jsoniter
+
+package json
+
+import jsoniter "github.com/json-iterator/go"
+
+var (
+	json = jsoniter.ConfigCompatibleWithStandardLibrary
+	// Marshal is exported by gin/json package.
+	Marshal = json.Marshal
+	// Unmarshal is exported by gin/json package.
+	Unmarshal = json.Unmarshal
+	// MarshalIndent is exported by gin/json package.
+	MarshalIndent = json.MarshalIndent
+	// NewDecoder is exported by gin/json package.
+	NewDecoder = json.NewDecoder
+	// NewEncoder is exported by gin/json package.
+	NewEncoder = json.NewEncoder
+)