Revert removed IFS logic

Address concerns re #2372.

config/action.d/xarf-login-attack.conf

@@ -58,6 +58,8 @@ actionban = oifs=${IFS};
             PORT=<port>
             DATE=`LC_ALL=C date --date=@<time> +"%%a, %%d %%h %%Y %%T %%z"`
             if [ ! -z "$ADDRESSES" ]; then
+                oifs=${IFS}; IFS=,; ADDRESSES=$(echo $ADDRESSES)
+                IFS=${oifs}      
                 if [ ! -z "$DONTSEND" ]; then
                     for ckaddr in "${DONTSEND[@]}"; do
                         if [[ "$ADDRESSES" == *"$ckaddr"* ]]; then