Babel: Parse sub-TLVs and skip TLVs with mandatory sub-TLV
RFC6126bis formally introduces sub-TLVs to the Babel protocol, including mandatory sub-TLVs. This adds support for parsing sub-TLVs to the Babel protocol and skips TLVs that contain mandatory sub-TLVs, as per the spec. For details, see section 4.4 of https://tools.ietf.org/html/draft-ietf-babel-rfc6126bis-02 Thanks to Toke Høiland-Jørgensen <firstname.lastname@example.org> for the patch.
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