dns, cares: don't filter NOTIMP, REFUSED, SERVFAIL

Report the aforementioned DNS server failure codes as-is, stop c-ares
from reporting them as ARES_ECONNREFUSED.

Reported by Steve Freegard.
gitignore: Ignore release tarballs and shasum files
stream: Remove chunkSize pipe option
streams: Split up pipe flow function
FIXUP: remove pipe chunk size
Set 'domain' on all objects passed to MakeCallback
process: Simplify domain checks in makeCallback
net: Always set handle.reading, Socket.ondata
net: Break up handle.onread function
net: writeReq is always object or null
FIXUP domain lint
stream: Split up read() method
wip: prevent some deopts in net-pipe