Sequencer new option to open sequence config file when initialised using initSeqConfig

Sequences with exit in step_config, changed to return to support opening config file on first run

seqs/mailserver.sh

@@ -34,7 +34,7 @@ step_config() {
     echo "     Domain: $MAS_DOMAIN"
   elif [ $? -eq 1 ] ; then
     # Config $CONFIG_FILE_NAME created. Needs modification first
-    exit 1
+    [ $DRY -eq 0 ] && return 1
   fi
 }