Subject unl list to consensus. (#186)

* Unl hash in consensus proposals.
* Unl syncing and sync request serving.
* Adding unl hash to the ledger block.

src/conf.cpp

@@ -2,7 +2,6 @@
 #include "conf.hpp"
 #include "crypto.hpp"
 #include "util/util.hpp"
-#include "unl.hpp"
 
 namespace conf
 {
@@ -489,9 +488,6 @@ namespace conf
             return -1;
         }
 
-        // Populate unl.
-        unl::init(cfg.unl);
-
         // Populate runtime contract execution args.
         if (!cfg.binargs.empty())
             util::split_string(cfg.runtime_binexec_args, cfg.binargs, " ");