- xdsclient.New() no longer takes any input, all configs are from bootstrap file
- added a NewForTesting()
- The returned *Client is a wrapper of the underlying client implementation, for ref-couting
- xds-resolver and xds-server no longer calls bootstrap.NewConfig. It only calls xdsclient.New()
* xds: Server implementation.
* Remove security related code.
* Add a blocking newListenerWrapper() method.
* Fix some comments.
* Use non-blocking dial.
* Use WaitForReady().
* Use localhost instead of 127.0.0.1
* Another attempt to make the tests happy on GA.
* Make vet happy.
* Add a missing return.