Communities / LocalPref routemaps: create one route map per neigh #2292
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The current implementation creates one route map per localpref / community, duplicating the same route-map for each advertisement (while what we really need is one route map, many prefix-lists entries, one per service).
Here we collect all the communities / localpref / large communities per neighbor, and we use it to generate a route-map per neighbor per community / localpref only once.