Fix updating of error in model output.
Check validation test error for covtype and mnist DL py tests.
Add checking of error, but comment out for now since I can't figure out how to
ignore a column by name (which is 100% correlated with the response).
Merge branch 'master' of https://github.com/h2oai/h2o-dev
Uncomment commented-out error checking.
Update error tolerance.
Merge branch 'master' of https://github.com/h2oai/h2o-dev