Reduce FileDownloader timeout in maintainer

We don't know which config server has the file, so it's
better to have lower timeout and retry another server (also since
downloader does retries within timeout, might need to look into that).

configserver/src/main/java/com/yahoo/vespa/config/server/maintenance/ApplicationPackageMaintainer.java

@@ -43,6 +43,7 @@
 public class ApplicationPackageMaintainer extends ConfigServerMaintainer {
 
     private static final Logger log = Logger.getLogger(ApplicationPackageMaintainer.class.getName());
+    private static final Duration fileDownloaderTimeout = Duration.ofSeconds(30);
 
     private final File downloadDirectory;
     private final Supervisor supervisor = new Supervisor(new Transport("filedistribution-pool")).setDropEmptyBuffers(true);
@@ -126,7 +127,7 @@ private static FileDownloader createFileDownloader(ApplicationRepository applica
         List<String> otherConfigServersInCluster = getOtherConfigServersInCluster(applicationRepository.configserverConfig());
         ConfigSourceSet configSourceSet = new ConfigSourceSet(otherConfigServersInCluster);
         ConnectionPool connectionPool = new FileDistributionConnectionPool(configSourceSet, supervisor);
-        return new FileDownloader(connectionPool, supervisor, downloadDirectory, Duration.ofSeconds(60));
+        return new FileDownloader(connectionPool, supervisor, downloadDirectory, fileDownloaderTimeout);
     }
 
     @Override