see if a big timeout on the remove_key() works
skip col 1 in covtype, maybe too slow (altitude)
remote h2o's may or may be started with the -ip specified
add a  force_ip that can be True/False to say whether the ip used to scp the h2o jar over to a machine, should also be passed to h2o when the java -jar h2o.jar xxx happens. Don't want it all the time, so we can test h2o's ability to self identify when remote machine is used
will need it for h2o's on bridged networks, with different public ip (which we already have to know to scp the files) just a question of whether h2o is told also.
Merge branch 'master' of github.com:0xdata/h2o