fix use of bundled kubectl

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

__mocks__/electron.js

@@ -0,0 +1,14 @@
+module.exports = {
+  require: jest.fn(),
+  match: jest.fn(),
+  app: {
+    getVersion: jest.fn().mockReturnValue("3.0.0"),
+    getPath: jest.fn().mockReturnValue("/foo/bar")
+  },
+  remote: {
+    app: {
+      getPath: jest.fn()
+    }
+  },
+  dialog: jest.fn()
+};