let another bad result be allowed
Merge branch 'master' of github.com:0xdata/h2o
readding
Backport bugfix for missing fence on file import

First time reading an imported file, need to block until file chunk is
loaded.
Nicer error recovery

Do not attempt to send partial data in a Autobuffer.close called in a
catch(IOException) block from RPC.  Just use drainClose()
Downgrade multicast fails to warns

We survive nearly all multicast fails with retries
add another case as legal result
Merge branch 'master' of github.com:0xdata/h2o
Merge branch 'master' into aboyoun-coxph