* Add plugin support for jcli commands

* Move types of config into a new package

* Commit bindata.go

* Fix the package import errors

* Allow sub-command set their own config loading policy

* Add support calculate download link by runtime

* Add support to download a tar type of plugin file

* Add documentation about jcli plugin

* Fix the wrong imports

* Format the code lines

* Format the output of config plugins list

* Package re-order

* Fix the unit test errors