[State Sync] Decrease health checker aggression.
[State Sync] Decrease health checker aggression.

Closes: #403

aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core,aptos-labs/aptos-core