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

seqs/postgrey.sh

@@ -34,7 +34,7 @@ step_1() {
   exe apt install "$toolDeps" $aptOpt
 }
 
-step_2_info() { 
+step_2_info() {
   echo "Add cron to update whitelist_clients from"
   echoinfo "$updateUrl"
 }