Improve examples test (#9467)

This PR moves the examples test to where it belongs and also include the
following improvements:

- Removed test cases defined for non-existent files;
- Add guard against ineffective tests against missing files;
- Remove the special case for scheduler-policy-config which is no longer
  an example, the dependency on the related go module is thus
  eliminated;
- Updated the .tavis.yml file to use the new test case: the instruction
  sequence is adjusted to ensure the correct version of kubernetes is
  fully prepared before we do `go get -v -t`.
- The examples_test.go is formatted using `gofmt`;
- Verbose output during test has been added.
- A separate test case is added for CN translation.

Related: #9285

.travis.yml

@@ -7,16 +7,16 @@ install:
 - export PATH=$GOPATH/bin:$PATH
 - mkdir -p $HOME/gopath/src/k8s.io
 - mv $TRAVIS_BUILD_DIR $HOME/gopath/src/k8s.io/website && cd $HOME/gopath/src/k8s.io/website
-# Fetch dependencies for us to run the tests in test/examples_test.go
-- go get -t -v k8s.io/website/test
-# Make sure we are testing against the correct branch
-- pushd $GOPATH/src/k8s.io/kubernetes && git checkout release-1.11 && popd
 
-# Simplified deduplication of dependencies.
+# Make sure we are testing against the correct branch
+- pushd $GOPATH/src/k8s.io && git clone https://github.com/kubernetes/kubernetes && popd
+- pushd $GOPATH/src/k8s.io/kubernetes && git checkout release-1.11 && popd
 - cp -L -R $GOPATH/src/k8s.io/kubernetes/vendor/ $GOPATH/src/
 - rm -r $GOPATH/src/k8s.io/kubernetes/vendor/
 
+# Fetch additional dependencies to run the tests in examples/examples_test.go
+- go get -t -v k8s.io/website/content/en/examples
+
 script:
-# TODO(bep)
-- go test -v k8s.io/website/test #fixed by https://github.com/kubernetes/website/pull/8388
+- go test -v k8s.io/website/content/en/examples
 #- ./verify-docs-format.sh