In order to conflict to floodlight's LinkInfo.
Change the LinkInfo to LinkInfoForOmniUI
	1.create class member for link infomation
	2.override the serialize way
Change the LinkInfo to LinkInfoForOmniUI
Modify the LinkResource.java
	1.get the link infomation from ILinkDiscoverySerivice
	2.check the link and add to the result list

Use  "curl -s http://localhost:8080/wm/omniui/link/json/" to test its
functionality and it works.