Change timeout in config proxy file distribution server code

Timeout in waitFor in FileAcquirerImpl is 60 seconds, need lower
timeout in config proxy to be able to respond before it times out.

config-proxy/src/main/java/com/yahoo/vespa/config/proxy/filedistribution/FileDistributionAndUrlDownload.java

@@ -33,9 +33,7 @@ public void close() {
     private FileDownloader createDownloader(Supervisor supervisor, ConfigSourceSet source) {
         return new FileDownloader(new FileDistributionConnectionPool(source, supervisor),
                                   supervisor,
-                                  Duration.ofMinutes(5));
+                                  Duration.ofSeconds(55)); // Should be lower than the timeout in FileAcquirer
     }
 
-
-
 }