abm structs generated from apple-device-services repo

[jessepeterson]

Generate the ABM structs from the Apple Device Services repo using go-jsonschema. Add a single ABM call as an example (for the single service we have supported for now). The re-marshalled JSON exactly matches the raw HTTP json returned from the service:

$ diff -u /tmp/b1o.json /tmp/b2o.json
$ ls -l /tmp/b1o.json /tmp/b2o.json
-rw-r--r--  1 user  wheel  1179 Sep  8 12:21 /tmp/b1o.json
-rw-r--r--  1 user  wheel  1179 Sep  8 12:21 /tmp/b2o.json
$ head -2 /tmp/b1o.json /tmp/b2o.json
==> /tmp/b1o.json <==
{
  "data": [

==> /tmp/b2o.json <==
{
  "data": [

I.e. using this:

	c := goaxm.NewClient(s)

	resp, err := c.ABMv1MDMServers(context.Background(), "myAXMName")
	if err != nil {
		log.Fatal(err)
	}

	err = json.NewEncoder(os.Stdout).Encode(resp)
	if err != nil {
		log.Fatal(err)
	}

(And comparing with the curl transparent reverse proxy)