zetaclient scheduler becomes desynced

[gartnera]

It seems that TryOutboundProcessor will be called at different times on different machines (~5 seconds difference). This will degrade keysign performance.

This can partially be attributed desync based on the start time of zetaclient:

node/zetaclient/orchestrator/orchestrator.go

Line 292 in 08ff881

observeTicker := time.NewTicker(3 * time.Second)

We should subscribe to new block events via websockets like this so that we can react to new block immediately without polling.