fix(postfix, smtp): make sure that sasl_passwd is updated

added To Do label

assigned to @arthur.boudreault

We encountered a bug with SMTP and postfix. Basically sasl_passwd file hadn't been updated and so the smtp relay wouldn't work.

When SMTP YNH settings are updated, make sure that sasl_passwd is regenerated as well.

postmap /etc/postfix/sasl_passwd -> regénération de la db (identifiants live postfix)
postfix reload

Comment from @thomas_michel

Pour ma part, les commandes que j'ai identifié s'il y avait besoin de scripter ça, c'est :
1. checker si le mot de passe SMTP a changé, et si oui positionner un flag à true (on passe par un flag car cette indication de chgt de mdp sert à autre chose aussi)
2. si le flag est true, lancer les commandes `postmap /etc/postfix/sasl_passwd` puis `postfix reload`

Edit: this issue is known is will be fixed by the team later on.

added bug confirmed labels

YunoHost 11.1 has been released but issue doesn't seem to have been fixed. Keeping this issue open in case it reappears.

removed To Do label