dht: Implement operator<< for decorated_key

dht/i_partitioner.cc

@@ -158,6 +158,10 @@ std::ostream& operator<<(std::ostream& out, const token& t) {
     return out;
 }
 
+std::ostream& operator<<(std::ostream& out, const decorated_key& dk) {
+    return out << "{key: " << dk._key << ", token:" << dk._token << "}";
+}
+
 // FIXME: get from global config
 // FIXME: make it per-keyspace
 murmur3_partitioner default_partitioner;

dht/i_partitioner.hh

@@ -170,6 +170,8 @@ bool operator!=(const decorated_key& lht, const decorated_key& rht);
 
 std::ostream& operator<<(std::ostream& out, const token& t);
 
+std::ostream& operator<<(std::ostream& out, const decorated_key& t);
+
 i_partitioner& global_partitioner();
 
 } // dht