test: update mocked graceful-fs for configure test

Add missing functions "unlink()" and "symlink()" to mocked module.

Author: DeeDeeG

test/test-configure-python.js

@@ -14,7 +14,9 @@ const configure = requireInject('../lib/configure', {
     mkdir: function (dir, options, cb) { cb() },
     promises: {
       writeFile: function (file, data) { return Promise.resolve(null) }
-    }
+    },
+    unlink: function (path, cb) { cb() },
+    symlink: function (target, path, cb) { cb() }
   }
 })