gluon-hoodselector: util.lua, use taps instead of spaces. Use posix.unistd.access instead of io.open

Signed-off-by: Jan-Tarek Butt <tarek@ring0.de>

package/gluon-hoodselector/luasrc/usr/lib/lua/hoodselector/util.lua

@@ -1,3 +1,4 @@
+local unistd = require('posix.unistd')
 local util = require 'gluon.util'
 local json = require 'jsonc'
 local uci = require('simple-uci').cursor()
@@ -43,7 +44,7 @@ function M.get_default_hood(jhood)
 	return nil
 end
 
--- bool if direct VPN. The detection is realised by searching the fastd network interface inside the originator table
+-- Returns true if the node has an established running VPN connection.
 function M.direct_vpn()
 	for outgoing_if in io.popen(string.format("batctl o"), 'r'):lines() do
 		-- escape special chars "[]-"
@@ -157,7 +158,7 @@ function M.restart_services()
 	}
 
 	for proc in ipairs(proc_tbl) do
-    if io.open("/etc/init.d/"..proc, 'r') ~= nil then
+		if unistd.access("/etc/init.d/"..proc, "x") == 0 then
 			print(proc.." restarting ...")
 			os.execute("/etc/init.d/"..proc.." restart")
 		end