Deletes a permission from the backend, model permission

            :param name:
                name of the permission: 'can_add','can_edit' etc...

def del_permission(self, name):
        """
            Deletes a permission from the backend, model permission

            :param name:
                name of the permission: 'can_add','can_edit' etc...
        """
        perm = self.find_permission(name)
        if perm:
            try:
                self.get_session.delete(perm)
                self.get_session.commit()
            except Exception as e:
                log.error(c.LOGMSG_ERR_SEC_DEL_PERMISSION.format(str(e)))
                self.get_session.rollback()