Babel: Parse flags in Hello TLV
RFC6126bis introduces a flags field for the Hello TLV, and adds a unicast flag that is used to signify that a hello was sent as unicast. This adds parsing of the flags field and ignores such unicast hellos, which preserves compatibility until we can add a proper implementation of the unicast hello mechanism. Thanks to Toke Hoiland-Jorgensen for the patch.
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