PUB-895 removed dangerous code style leading to overwritting returned
future by null. Which caused that writes were not blocked!
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' of github.com:0xdata/h2o
Fix for PUB-895 - local key snapshot was skipping Prime values in NBHM, hence
a machine was able to see a snapshot missing some keys causing a problem
in preparation environment of Exec2 (Exec2 execution engine was
expecting Last.value.X, but it was missing).
PUB-895 test marked as passing.
Merge branch 'master' of github.com:0xdata/h2o
Minor change in comments.