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The message "Subscribed to Topics" is somewhat misleading... it should probably say "Subscribed to sources" since it's echoing the "observation_sources" parameter. Here's the code:

  // get the topics that we'll subscribe to from the parameter server
  nh.param("observation_sources", topics_string, std::string(""));
  ROS_INFO("    Subscribed to Topics: %s", topics_string.c_str());

Further down you'll see that it's actually subscribing to the topic you specified. If you turn on debug you'll see the message:

ROS_DEBUG("Creating an observation buffer for source %s, topic %s, frame %s", source.c_str(), topic.c_str(),
          sensor_frame.c_str());

As for the message "Request for map failed; trying again..." -- David Lu is correct, that message is coming from amcl.