https://wiki.opendaylight.org/view/YANG_Tools:YANG_to_Java_Mapping#Identity
https://wiki.opendaylight.org/view/OpenDaylight_Controller:MD-SAL:Toaster_Tutorial
http://blog.csdn.net/aaa_aa000/article/details/45840977
https://wiki.opendaylight.org/view/OpenDaylight_Controller:MD-SAL:Toaster_Step-By-Step
https://wiki.opendaylight.org/view/Using_Blueprint
https://wiki.opendaylight.org/view/OpenDaylight_Controller:Config:Examples:Sample_Project
1、yang文件生成
（1）module会生成ToasterData接口和ToasterService接口，ToasterData可以获取到此yang文件所有的container，leaf等，ToasterService有rpc方法，实现rpc方法的类要实现这个接口
（2） container生成Toaster接口和ToasterBuilder
identity生成抽象类
（3）有notification会生成ToasterListener，每个notification生成一个接口和一个builder