control-center/serviced — pull request #1285 by wplu (2014-11-12 18:15:40+00:00)
Title: return err for RemoveHost if hostid does not exist

DEMO:
```
# plu@plu-9: serviced host list
ID	POOL	NAME	ADDR	CORES	MEM	NETWORK
570a276e	default	plu-9	172.17.42.1	12	33659494400	172.17.0.0/255.255.0.0

# plu@plu-9: serviced host remove 570a276e
570a276e

# plu@plu-9: serviced host list
no hosts found

# plu@plu-9: serviced host remove 570a276e
I1112 12:13:13.079290 13533 clients.go:94] rpc error, resetting cached client: HostID 570a276e does not exist
570a276e: HostID 570a276e does not exist
```