Merged requested to merge element/ispconfig3:6424-Notifications-to-reseller-and-clients-not-working into develop
Fix of some wierd patch, that get into a stable.
Read all clients email, group and reseller to array. When notification is needed then use data from array and send email.
Oryginally when having multiple notifications, each time there was request to DB.
Closes #6424 (closed)