message: Add BU operated seeder for the main net.
  The BU seeder is reachable at seed.bitcoinunlimited.info
  To get a list of peers just from the command line issue
  a command like this one:
  dig seed.bitcoinunlimited.info
  In the process set sipa's seeder and bu seeder as able to
  support whitelist for service filter.
diff: @@ -138,7 +138,9 @@ public:
  // BITCOINUNLIMITED START
  vSeeds.push_back(CDNSSeedData("btcc.com", "seed.btcc.com")); // BTCC
  vSeeds.push_back(CDNSSeedData("bitnodes.io", "seed.bitnodes.io")); // Bitnodes (Addy Yeow)
  - vSeeds.push_back(CDNSSeedData("bitcoin.sipa.be", "seed.bitcoin.sipa.be")); // Pieter Wuille
  + vSeeds.push_back(CDNSSeedData("bitcoin.sipa.be", "seed.bitcoin.sipa.be", true)); // Pieter Wuille, only supports x1, x5, x9, and xd
  + vSeeds.push_back(CDNSSeedData("bitcoinunlimited.info", "seed.bitcoinunlimited.info", true)); // BU seeder
  + vSeeds.push_back(CDNSSeedData("xf2.org", "bitseed.xf2.org")); // Jeff Garzik
  // BITCOINUNLIMITED END
  base58Prefixes[PUBKEY_ADDRESS] = std::vector<unsigned char>(1,0);
  