posixAccount foreignKey is wrong

Description

There was a broken foreignKey from posixAccount to «group» which does not exists as a class. This was changed to «ogroup» in #5705 (closed) but this is also wrong, correct value is posixGroup.

Plugin with the defect

posix

created branch 5707-posixaccount-foreignkey-is-wrong

mentioned in commit 8120b335

closed via commit 27544866

closed via commit 8120b335

mentioned in commit 32e1451e

added fixes-merged and removed fixes labels

changed milestone to %50

added Fixed label

removed Bugs label

added PJ1802-0188 label