[feature] add super idle config

[BohuTANG]

Summary

xenon does enable raft at the step16 of rebuildme, but some IDLE node should not enable raft to FOLLOWER, here change the StartAsIDLE config to SuperIDLE.
If a node is configed as SuperIDLE, the enable raft will do:

1. Fires 'change master to'
2. Keep IDLE state