[recipe_modules/file] add real file module to engine.

recipe_modules/file/examples/copy.expected/basic.json

Index: recipe_modules/file/examples/copy.expected/basic.json
diff --git a/recipe_modules/file/examples/copy.expected/basic.json b/recipe_modules/file/examples/copy.expected/basic.json
new file mode 100644
index 0000000000000000000000000000000000000000..9038ac203bf1dd75b71fcbaf362959bb2cdf7fcc
--- /dev/null
+++ b/recipe_modules/file/examples/copy.expected/basic.json
@@ -0,0 +1,77 @@
+[
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "Here is some text data",
+      "[START_DIR]/some file"
+    ],
+    "infra_step": true,
+    "name": "write a file"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/some file",
+      "[START_DIR]/new path"
+    ],
+    "infra_step": true,
+    "name": "copy it"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/new path",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "read it"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "move",
+      "[START_DIR]/new path",
+      "[START_DIR]/new new path"
+    ],
+    "infra_step": true,
+    "name": "move it"
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[START_DIR]/new new path",
+      "/path/to/tmp/"
+    ],
+    "infra_step": true,
+    "name": "read it (2)"
+  },
+  {
+    "name": "$result",
+    "recipe_result": null,
+    "status_code": 0
+  }
+]