Wait for 90 percent of stake before starting (#16340) (#16343)

(cherry picked from commit 3429785d9b)

Co-authored-by: sakridge <sakridge@gmail.com>

core/src/validator.rs

@@ -1269,7 +1269,7 @@ fn wait_for_supermajority(
 
         let gossip_stake_percent = get_stake_percent_in_gossip(&bank, &cluster_info, i % 10 == 0);
 
-        if gossip_stake_percent >= 80 {
+        if gossip_stake_percent >= 90 {
             break;
         }
         // The normal RPC health checks don't apply as the node is waiting, so feign health to