* Add plugin search show plugin version And Update go-sum file

* Update Query plugins method And Add Unit Test

* Update Get data from PluginApi modified to get from UpdateCenter

* Add Unit Testing

* Add unit testing

* remove annotation

* update test

* fix unit test coverage

* fix some questions

* update one result name

* update some questions

* update unit test and fix some question

* fix search plugin question

* remove some comment

* update test method name

* split the method

* update some code

* Add support to download Jenkins

* Add test cases for http downloader

* Exclued mock files

* Exclued mock files

* Add test cases for center download

* Remove mock files

* Fix gen-mock

* Add init stage for building

* Add test case for jenkins upgrade cmd

* Add test casee for center watch cmd

* Add test case for center cmd