fix master maintenance logic

Signed-off-by: Lei Liu <lei01.liu@horizon.ai>

weed/command/scaffold.go

@@ -346,6 +346,8 @@ scripts = """
 """
 sleep_minutes = 17          # sleep minutes between each script execution
 
+filer_url = "http://localhost:8888/"
+
 sequencer_type = memory     # Choose [memory|etcd] type for storing the file id sequence
 
 # when sequencer.type = etcd, set listen client urls of etcd cluster that store file id sequence