Fixes missing imports

scripts/lua/modules/rrd_paths.lua

@@ -2,6 +2,7 @@
 -- (C) 2021 - ntop.org
 --
 
+local dirs = ntop.getDirs()
 -- NOTE: use the slim utils version here
 require("ntop_utils")
 

scripts/lua/modules/timeseries/drivers/influxdb.lua

@@ -1864,6 +1864,7 @@ local function isCompatibleVersion(version)
 end
 
 function driver.init(dbname, url, days_retention, username, password, verbose)
+    require "lua_utils"
     local timeout = getInfluxDBQueryTimeout()
 
     -- Check version