was the OutWrapper thing redundant in build_cloud_with_hosts? it's in build_cloud()

changed tree counts in rf_covtype20x_fvec (which is only doing covtype)
still have to adapt test_rf_predict_fvec.py to the new predict output for fvec (percent, not just class result?)
always run 50 files. also h2e (h2o_exec) import was missing
Merge branch 'master' of github.com:0xdata/h2o