create scripts 'mdns' and 'set_root_password'

edit for secure create_db.sh

scripts/common/common_utils.sh

@@ -10,7 +10,7 @@ check_root() {
 }
 
 generate_token() {
-    tr -dc 'A-Za-z0-9@#%+=_-' < /dev/urandom | head -c "${1:-32}"
+    tr -dc 'A-Za-z0-9' < /dev/urandom | head -c "${1:-32}"
     echo
 }