message: [sql_db_plugin] using const char* for options
diff: namespace {
  const char* BUFFER_SIZE_OPTION = "sql_db-queue-size";
  const char* SQL_DB_URI_OPTION = "sql_db-uri";
  +const char* RESYNC_OPTION = "resync-blockchain";
  +const char* REPLAY_OPTION = "replay-blockchain";
  }
  namespace fc { class variant; }
  @@ -76,10 +78,10 @@ void sql_db_plugin::plugin_initialize(const variables_map& options)
  ilog("connecting to ${u}", ("u", uri_str));
  m_database->connect(uri_str);
  - if (options.at("resync-blockchain").as<bool>()) {
  + if (options.at(RESYNC_OPTION).as<bool>()) {
  ilog("Resync requested: wiping database");
  }
  - else if (options.at("replay-blockchain").as<bool>()) {
  + else if (options.at(REPLAY_OPTION).as<bool>()) {
  ilog("Replay requested: wiping mongo database on startup");
  }
  