ldpd: use red-black trees to store 'l2vpn' elements

Using red-black trees instead of linked lists brings the following
benefits:
1 - Elements are naturally ordered (no need to reorder anything before
    outputting data to the user);
2 - Faster lookups/deletes: O(log n) time complexity against O(n).

The insert operation with red-black trees is more expensive though,
but that's not a big issue since lookups are much more frequent.

Signed-off-by: Renato Westphal <renato@opensourcerouting.org>

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