some quick variants around independent exec activity at multiple nodes
Merge branch 'master' of github.com:0xdata/h2o
target each hdfs cluster here
Merge branch 'master' of github.com:0xdata/h2o
Fix of bug of unclosed vectors.

The vectors were closed only
in MRTask2#getResult call, nevertheless
dfork/asynexec calls do not expect that.
Hence the close of vecs were moved from
MRTask#getResult into #postLocal call
Merge branch 'master' of github.com:0xdata/h2o

Conflicts:
	py/testdir_single_jvm_fvec/test_exec2_operators2.py
typo
Merge branch 'master' of https://github.com/0xdata/h2o into speedrf