Fix #3149: port mapping of TCP + UDP

Signed-off-by: Tzu-Jung Lee <roylee17@gmail.com>
[docs] Fix for wrong version warning on master instead of latest.
Merge pull request #3473 from dhrp/docs-version-warning-fix

[docs] Fix for wrong version warning on master instead of latest.
Update REMOTE_TODO.md
Make CopyFileWithTar use a pipe instead of a buffer. Save more than 1Gb of ram for a 500Mb file.
Merge pull request #3477 from creack/fix_tar_leaks

Make CopyFileWithTar use a pipe instead of a buffer. Save more than 1Gb of ram for a 500Mb file.
Run 'gofmt -s -w'
Merge pull request #3480 from tianon/gofmt

Run 'gofmt -s -w'
Merge pull request #3435 from roylee17/3149-fix_port_mapping_of_tcp_plus_udp

Fix #3149: port mapping of TCP + UDP