HDFS-1703 changed the behavior of the start/stop scripts so that the masters file is no longer used to indicate which hosts to start the 2NN on. The 2NN is now started, when using start-dfs.sh, on hosts only when dfs.namenode.secondary.http-address is configured with a non-wildcard IP. This means you can not start a NN using an http-address specified using a wildcard IP. We should allow a 2NN to be started with the default config, ie start-dfs.sh should start a NN, 2NN and DN. The packaging already works this way (it doesn't use start-dfs.sh, it uses hadoop-daemon.sh directly w/o first checking getconf) so let's bring start-dfs.sh in line with this behavior.