Start up the atlas node.
    Return a bundle of atlas state

def atlas_node_init(my_hostname, my_portnum, atlasdb_path, zonefile_dir, working_dir):
    """
    Start up the atlas node.
    Return a bundle of atlas state
    """
    atlas_state = {}
    atlas_state['peer_crawler'] = AtlasPeerCrawler(my_hostname, my_portnum, atlasdb_path, working_dir)
    atlas_state['health_checker'] = AtlasHealthChecker(my_hostname, my_portnum, atlasdb_path)
    atlas_state['zonefile_crawler'] = AtlasZonefileCrawler(my_hostname, my_portnum, atlasdb_path, zonefile_dir)
    # atlas_state['zonefile_pusher'] = AtlasZonefilePusher(my_hostname, my_portnum, atlasdb_path, zonefile_dir)

    return atlas_state