Double grandpa gossip duration for Kusama and test networks (#5448)

* Double grandpa gossip duration.

* Make resend period slightly larger.

So it won't get triggered by additional grandpa delay.

* Bump other values as well.

* Don't change gossip duration on Polkadot.

(and Westend as it is meant to be a testbed for Polkadot)

polkadot/node/network/approval-distribution/src/lib.rs

@@ -138,9 +138,9 @@ impl AggressionConfig {
 impl Default for AggressionConfig {
 	fn default() -> Self {
 		AggressionConfig {
-			l1_threshold: Some(10),
-			l2_threshold: Some(25),
-			resend_unfinalized_period: Some(5),
+			l1_threshold: Some(13),
+			l2_threshold: Some(28),
+			resend_unfinalized_period: Some(8),
 		}
 	}
 }