update draft-06 tests: "id" -> "$id"

Author: epoberezkin

tests/draft6/ref.json

@@ -244,7 +244,7 @@
     {
         "description": "Recursive references between schemas",
         "schema": {
-            "id": "http://localhost:1234/tree",
+            "$id": "http://localhost:1234/tree",
             "description": "tree of nodes",
             "type": "object",
             "properties": {
@@ -257,7 +257,7 @@
             "required": ["meta", "nodes"],
             "definitions": {
                 "node": {
-                    "id": "http://localhost:1234/node",
+                    "$id": "http://localhost:1234/node",
                     "description": "node",
                     "type": "object",
                     "properties": {

tests/draft6/refRemote.json

@@ -74,14 +74,14 @@
     {
         "description": "base URI change - change folder",
         "schema": {
-            "id": "http://localhost:1234/scope_change_defs1.json",
+            "$id": "http://localhost:1234/scope_change_defs1.json",
             "type" : "object",
             "properties": {
                 "list": {"$ref": "#/definitions/baz"}
             },
             "definitions": {
                 "baz": {
-                    "id": "folder/",
+                    "$id": "folder/",
                     "type": "array",
                     "items": {"$ref": "folderInteger.json"}
                 }
@@ -103,14 +103,14 @@
     {
         "description": "base URI change - change folder in subschema",
         "schema": {
-            "id": "http://localhost:1234/scope_change_defs2.json",
+            "$id": "http://localhost:1234/scope_change_defs2.json",
             "type" : "object",
             "properties": {
                 "list": {"$ref": "#/definitions/baz/definitions/bar"}
             },
             "definitions": {
                 "baz": {
-                    "id": "folder/",
+                    "$id": "folder/",
                     "definitions": {
                         "bar": {
                             "type": "array",
@@ -136,7 +136,7 @@
     {
         "description": "root ref in remote ref",
         "schema": {
-            "id": "http://localhost:1234/object",
+            "$id": "http://localhost:1234/object",
             "type": "object",
             "properties": {
                 "name": {"$ref": "name.json#/definitions/orNull"}