* Fix for issue 4656 typescript-node generate invalid require statement instead of import statement
* Fixed broken link under testing templates
* Result of run generate-samples.sh / typescript-node*
* import stmt depending on flag supportsES6
* Update petstore sample for typescript-node
* import ... from stmt for http/request module
* update samples
* update doc
Co-authored-by: William Cheng <wing328hk@gmail.com>