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Unknown options in IPv6 Router Advertisements should not be logged #7

Description

@eblosug

The arpread component does not parse all options that can occur in IPv6 router advertisements.

The log contains many entries like

Jan 14 03:58:54 eblocker arp_read[594]: ignoring unknown option: 24
Jan 14 03:58:54 eblocker arp_read[594]: ignoring unknown option: 14

It's not feasible to support all options, see IPv6 Neighbor Discovery Option Formats, so the above log messages should be removed.

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