add TestDeleteL2NetworkOnKvm to unit test
add TestDeleteL2NetworkOnKvm to unit test

Alvin-Lau/zstack,zstackorg/zstack,WangXijue/zstack,HeathHose/zstack,liningone/zstack,hhjuliet/zstack,zxwing/zstack-1,mingjian2049/zstack,AlanJager/zstack,HeathHose/zstack,MaJin1996/zstack,MatheMatrix/zstack,zxwing/zstack-1,zstackorg/zstack,Alvin-Lau/zstack,hhjuliet/zstack,AlanJinTS/zstack,zsyzsyhao/zstack,liningone/zstack,zxwing/zstack-1,newbiet/zstack,WangXijue/zstack,AlanJager/zstack,zstackio/zstack,winger007/zstack,camilesing/zstack,AlanJager/zstack,HeathHose/zstack,MatheMatrix/zstack,AlanJinTS/zstack,camilesing/zstack,camilesing/zstack,liningone/zstack,WangXijue/zstack,zstackio/zstack,MatheMatrix/zstack,zstackio/zstack,AlanJinTS/zstack,newbiet/zstack,zsyzsyhao/zstack,MaJin1996/zstack,Alvin-Lau/zstack,mingjian2049/zstack,winger007/zstack,mingjian2049/zstack