Require a minimum of 8 characters for passwords, to match Kratos min requirements

salt/common/tools/sbin/so-user

@@ -98,7 +98,7 @@ function validatePassword() {
   password=$1
 
   len=$(expr length "$password")
-  if [[ $len -lt 6 ]]; then
+  if [[ $len -lt 8 ]]; then
     fail "Password does not meet the minimum requirements"
   fi
   if [[ $len -gt 72 ]]; then