Check every minute whether authority-discovery key has changed (#8575)

* Check every minute whether authority-discovery key has changed

* Fix test

* Fix comment

* Use HashSet for latest_published_keys

* More fixing

* God I'm tired, sorry

substrate/client/authority-discovery/src/lib.rs

@@ -53,6 +53,11 @@ pub struct WorkerConfig {
 	///
 	/// By default this is set to 1 hour.
 	pub max_publish_interval: Duration,
+	/// Interval at which the keystore is queried. If the keys have changed, unconditionally
+	/// re-publish its addresses on the DHT.
+	///
+	/// By default this is set to 1 minute.
+	pub keystore_refresh_interval: Duration,
 	/// The maximum interval in which the node will query the DHT for new entries.
 	///
 	/// By default this is set to 10 minutes.
@@ -67,6 +72,7 @@ impl Default for WorkerConfig {
 			// not depend on the republishing process, thus publishing own external addresses should
 			// happen on an interval < 36h.
 			max_publish_interval: Duration::from_secs(1 * 60 * 60),
+			keystore_refresh_interval: Duration::from_secs(60),
 			// External addresses of remote authorities can change at any given point in time. The
 			// interval on which to trigger new queries for the current and next authorities is a trade
 			// off between efficiency and performance.