If the LB has an external vip, the member must have a local subnet-id
connected to a router with an uplink,
or the member must have an IP which is a FIP address
In addition, remove one leftover log, and remove a lock on router
id when it is None
Change-Id: Iefb492e43b5cc47a84ce82e4dfbcb0d1e5e6bffe