log init parameters in config files

supervisor/config.lua

@@ -4,3 +4,9 @@ SCADA_DEV_LISTEN = 16000
 SCADA_SV_LISTEN = 16100
 -- expected number of reactors
 NUM_REACTORS = 4
+-- log path
+LOG_PATH = "/log.txt"
+-- log mode
+--  0 = APPEND (adds to existing file on start)
+--  1 = NEW (replaces existing file on start)
+LOG_MODE = 0

supervisor/startup.lua

@@ -25,7 +25,7 @@ local println = util.println
 local print_ts = util.print_ts
 local println_ts = util.println_ts
 
-log.init("/log.txt", log.MODE.APPEND)
+log.init(config.LOG_PATH, config.LOG_MODE)
 
 log._info("========================================")
 log._info("BOOTING supervisor.startup " .. SUPERVISOR_VERSION)