Werk #11267: if_fortigate: Use ifName as ifAlias

The original check plugin "if_fortigate" uses the "ifName" under the guise of "ifAlias" because on Fortigate devices the "ifName" contains the technical interface names. By contrast "ifDescr" or "ifAlias" may contain user defined names.

In the ruleset "Network Interface and Switch Port Discovery" under "Appearance of network interface" the item can be specified: Either use the "Use index", "Use description" or "Use alias".

With the incompatible werk 6638 the "ifName" was substituted with "ifAlias". This means that the technical interface names are not available any more. This werk reverts the check plugin back to its original state: use "ifName" as "ifAlias" in order to make these technical names available again.

We cannot simply add another SNMP field because this may cause unforeseen performance loss.

In the future we have to find a performant solution to make the following four SNMP fields available for item names: "ifIndex", "ifName", "ifDescr" and "ifAlias".

Thus if you have configure "Use alias" in the ruleset "Network Interface and Switch Port Discovery" under "Appearance of network interface" on Fortigate devices you have to rediscover these hosts.

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