packer/rpc: make sure we read all the data
packer/rpc: a little more logging
packer/rpc: more logging in muxconn
packer/rpc: more logs
packer/rpc: more logging and fix a bug with read buffer start point
packer/rpc: get rid of trace level
packer/rpc: write only the remaining data on muxconn retry
update CHANGELOG
Merge branch 'master' of https://github.com/mitchellh/packer into docker-metadata