Werk #11525: lnx_if: Treat only interfaces with UP and LOWER_UP (bracket info from ip address) as UP

Previously we only checked <...,UP> in the bracket info and treated this interface as UP if and only if no output of ethtool is available.

Please have a look at the following scenarios and how we now determine whether an interface is UP:

• <BROADCAST,MULTICAST,UP,LOWER_UP> means that this interface has a link and is UP
• <NO-CARRIER,BROADCAST,MULTICAST,UP> means that this interface is configured and ADMIN UP but has no link
• <BROADCAST,MULTICAST> means that this interface is not configured

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