[BUG] Stop report solvency when the external chain block scanner is falling behind
On Chaosnet at the moment, bifrost has been down for a long time , for each external chain , there are a lot blocks need to be scanned. When we start bifrost and enable external chains , then there will have a lot MsgSolvency get send to thorchain , but it doesn't serve much purpose.
So when a chain client , block scanner is falling behind , then it should not report MsgSolvency to thornode.