refactoring changes from sequpgrade (endReturn, ...) and some modernizations

seqs/coturn.sh

@@ -47,7 +47,7 @@ step_10() {
   local ipRegex='^[0-2]*[0-9]{1,2}\.[0-2]*[0-9]{1,2}\.[0-2]*[0-9]{1,2}\.[0-2]*[0-9]{1,2}\/*[0-9]*$'
   local dnsUrl="46.182.19.48" #digitalcourage.de/support/zensurfreier-dns-server
   local dnsFallbackUrl="194.150.168.168" #dns.as250.net; Berlin/Frankfurt
-  
+
   local lLevelSave=${LOG_LEVEL:?}
   local lTimeSave=${LOG_TIME:-}
   local retval=0
@@ -74,7 +74,7 @@ step_10() {
     warning "Couldn't aquire public IP for ${sc_turnDomain}. Giving up."
     retval=1
 
-  else 
+  else
     local confIp=`cat "$toolConf" | grep "^external-ip" | cut -d'=' -f2`
 
     if [ "$pubIp" != "$confIp" ]; then
@@ -105,7 +105,7 @@ step_12() {
 
   info "Setup $ipCronLoc"
   addConf -s "$ipCron" "$ipCronLoc"
-} 
+}
 
 step_14_info() { echo "Setup ufw rules to allow upnp, optionally from a sepcific SOURCE_IP"; }
 step_14_options() { echo "[SOURCE_IP]"; }