Rename master plugin onExit hook to onShutdown

Rename the onExit hook for master plugins to onShutdown to better
reflect when it is invoked.

lib/plugin.js

@@ -127,7 +127,7 @@ class BaseMasterPlugin {
 	/**
 	 * Called when the master server is shutting down
 	 */
-	async onExit() { }
+	async onShutdown() { }
 }
 
 /**

master.js

@@ -250,8 +250,8 @@ async function shutdown() {
 
 		for (let [pluginName, masterPlugin] of masterPlugins) {
 			let startTime = Date.now();
-			await masterPlugin.onExit();
-			console.log(`Plugin ${pluginName} exited in ${Date.now() - startTime}ms`);
+			await masterPlugin.onShutdown();
+			console.log(`Plugin ${pluginName} shutdown in ${Date.now() - startTime}ms`);
 		}
 
 		stopAcceptingNewSessions = true;

plugins/research_sync/master.js

@@ -12,7 +12,7 @@ class MasterPlugin extends plugin.BaseMasterPlugin {
 		this.progressToBroadcast = new Set();
 	}
 
-	async onExit() {
+	async onShutdown() {
 		if (this.progressBroadcastId) {
 			clearTimeout(this.progressBroadcastId);
 		}

plugins/subspace_storage/master.js

@@ -177,7 +177,7 @@ class MasterPlugin extends plugin.BaseMasterPlugin {
 		}
 	}
 
-	async onExit() {
+	async onShutdown() {
 		clearInterval(this.autosaveId);
 		clearInterval(this.doleMagicId);
 		await saveDatabase(this.master.config, this.items);

test/lib/plugin.js

@@ -16,6 +16,7 @@ describe("lib/plugin", function() {
 			await instancePlugin.init();
 		})
 		it("should define defaults for hooks", async function() {
+			await instancePlugin.onMetrics();
 			await instancePlugin.onStart();
 			await instancePlugin.onStop();
 			instancePlugin.onExit();
@@ -30,7 +31,8 @@ describe("lib/plugin", function() {
 			await masterPlugin.init();
 		})
 		it("should define defaults for hooks", async function() {
-			await masterPlugin.onExit();
+			await masterPlugin.onMetrics();
+			await masterPlugin.onShutdown();
 		})
 	});