Check_MK Werk 6638: if_fortigate: Fix incorrect usage of Name as Alias

ID: 6638 Title: if_fortigate: Fix incorrect usage of Name as Alias Component: Checks & agents Level: 1 Class: Bug fix Version: 1.6.0i1 Werk #4539 introduced special handling for interfaces of Fortigate firewalls, but incorrectly substituted the ifName for the ifAlias, leading to incompatibilities for users using the alias as an item. Rediscovery is required to get the proper alias back as an item. If you do not use the alias, this does not affect you.