[model] Add function to judge whether host has been binded with hostgroup
[model] Add function to judge whether host has been binded with hostgroup

jojohappy/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus,jojohappy/falcon-plus,jojohappy/falcon-plus,taomaree/falcon-plus,jojohappy/falcon-plus,open-falcon/falcon-plus,taomaree/falcon-plus,taomaree/falcon-plus,open-falcon/falcon-plus,jojohappy/falcon-plus,open-falcon/falcon-plus,open-falcon/falcon-plus,taomaree/falcon-plus,jojohappy/falcon-plus